US20060196638A1 - System and method for thermal management using distributed synthetic jet actuators - Google Patents
System and method for thermal management using distributed synthetic jet actuators Download PDFInfo
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- US20060196638A1 US20060196638A1 US11/325,239 US32523906A US2006196638A1 US 20060196638 A1 US20060196638 A1 US 20060196638A1 US 32523906 A US32523906 A US 32523906A US 2006196638 A1 US2006196638 A1 US 2006196638A1
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- synthetic jet
- actuator
- housing
- chamber
- tube
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/46—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids
- H01L23/467—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements involving the transfer of heat by flowing fluids by flowing gases, e.g. air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F7/00—Pumps displacing fluids by using inertia thereof, e.g. by generating vibrations therein
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/009—Influencing flow of fluids by means of vortex rings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
- F15D1/00—Influencing flow of fluids
- F15D1/08—Influencing flow of fluids of jets leaving an orifice
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/16—Constructional details or arrangements
- G06F1/20—Cooling means
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20172—Fan mounting or fan specifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C2230/00—Boundary layer controls
- B64C2230/02—Boundary layer controls by using acoustic waves generated by transducers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T50/00—Aeronautics or air transport
- Y02T50/10—Drag reduction
Definitions
- the present invention is generally related to thermal management technology and, more particularly, is related to a system and method for cooling heat-producing bodies or components using distributed synthetic jet actuators.
- Cooling of heat-producing bodies is a concern in many different technologies. Particularly in microprocessors, the rise in heat dissipation levels accompanied by a shrinking thermal budget has resulted in the need for new cooling solutions beyond conventional thermal management techniques. Moreover, there is a greatly increased demand for effective thermal management strategies to be used within small handheld devices, such as portable digital assistants (PDA's), mobile phones, portable CD players, and similar consumer products. Indeed, thermal management is a major challenge in the design and packaging of state-of-the-art integrated circuits in single-chip and multi-chip modules.
- Forced convection can be implemented either with or without heat sinks.
- fans are employed to provide either global cooling or local cooling.
- Fans are capable of supplying ample volume flow rate, but there are several distinct disadvantages to using a fan. Fans are relatively inefficient in terms of the heat removed for a given volume flow rate. In addition, the use of fans to globally or locally cool a heated environment often results in electromagnetic interference and noise generated by the magnetic-based fan motor. Use of a fan also requires a relatively large number of moving parts in order to have any success in cooling a heated body or microelectronic component. For this or other reasons, fans may be hindered by long-term reliability.
- the need for thermal management has been met by employing a strategy of spreading the heat produced through the use of heat spreaders to the outer shell of the handheld. Subsequently, the heat generated is dissipated though the outer shell, or skin, of the device via natural convection.
- Embodiments of the present invention provide a device for thermal management in various environments. More specifically, the present embodiments include devices for cooling an area or device through the use of synthetic jet actuators in a distributed cooling apparatus.
- one embodiment of the device can be implemented as a device for thermal management comprising a synthetic jet actuator and a channel.
- the channel of this exemplary embodiment typically comprises a proximal end and a distal end, the proximal end being positioned adjacent to the synthetic jet actuator.
- Operation of the synthetic jet actuator preferably causes a synthetic jet stream to form at the distal end of the channel.
- the synthetic jet stream may also form at the proximal end of the channel.
- the synthetic jet actuator of this or other exemplary embodiments may comprise a housing defining an internal chamber and having at least one orifice in a wall of the housing.
- the synthetic jet actuator of this embodiment also preferably comprises a device for changing the volume of the internal chamber, wherein the volume changing device is preferably positioned adjacent to the housing.
- the device for changing the volume may actually make up a portion of the synthetic jet actuator housing.
- the volume changing device of some exemplary embodiments comprises a flexible diaphragm forming a portion of the synthetic jet actuator housing.
- the channel is comprised of one or more tubes connected to an external surface of a wall of the synthetic jet actuator housing.
- the tube (or tubes) typically encloses at least a portion of a synthetic jet actuator orifice.
- FIG. 1A is a schematic cross-sectional side view of a first exemplary embodiment zero net mass flux synthetic jet actuator with a control system.
- FIG. 1B is a schematic cross-sectional side view of the synthetic jet actuator of FIG. 1A depicting the jet as the control system causes the diaphragm to travel inward, toward the orifice.
- FIG. 1C is a schematic cross-sectional side view of the synthetic jet actuator of FIG. 1A depicting the jet as the control system causes the diaphragm to travel outward, away from the orifice.
- FIG. 2 is a cross-sectional side view of a second exemplary embodiment of a synthetic jet actuator.
- FIG. 3 is a bottom view of the second exemplary embodiment of a synthetic jet actuator of FIG. 2 .
- FIG. 4A is a cross-sectional side view of a distributed cooling apparatus.
- FIG. 4B is a cross-sectional side view of the tube used in the distributed cooling apparatus of FIG. 4A as the tube withdraws fluid from an ambient.
- FIG. 4C is a cross-sectional side view of the tube used in the distributed cooling apparatus of FIG. 4A as the tube creates a synthetic jet stream of fluid at an exit end of the tube.
- FIG. 5 is a cross-sectional top view of a distributed cooling apparatus for directing fluid flow to different areas of a heated environment.
- FIG. 6 is a three-dimensional view of a multiple actuator distributed cooling apparatus.
- FIG. 7 is a cross-sectional side view of the multiple actuator distributed cooling apparatus of FIG. 6 , focussing on one of the “plenums” of the multiple actuator distributed cooling apparatus.
- FIG. 8 is a cross-sectional side view of the multiple actuator distributed cooling apparatus of FIG. 6 , focussing on one of the “plenums” of the apparatus, where actuators have been installed into the “plenum.”
- FIG. 9 is a three-dimensional, cut-away view of the multiple actuator distributed cooling apparatus of FIG. 6 .
- FIG. 10 is a cut-away schematic rear view of the multiple actuator distributed cooling apparatus of FIG. 6 .
- FIG. 11A is a side view of the multiple actuator distributed cooling apparatus of FIG. 6 implemented into a cooling system.
- FIG. 11B is a front view of the multiple actuator distributed cooling apparatus of FIG. 6 implemented into a cooling system.
- FIG. 12A is a side view of a prior art cooling system.
- FIG. 12B is a side view of the cooling system of FIG. 12A wherein the multiple actuator distributed cooling apparatus of FIG. 6 has been implemented into the cooling system.
- FIG. 1A depicts an example of a synthetic jet actuator 10 comprising a housing 11 defining and enclosing an internal chamber 14 .
- the housing 11 and chamber 14 can take virtually any geometric configuration, but for purposes of discussion and understanding, the housing 11 is shown in cross-section in FIG. 1A to have a rigid side wall 12 , a rigid front wall 13 , and a rear diaphragm 18 that is flexible to an extent to permit movement of the diaphragm 18 inwardly and outwardly relative to the chamber 14 .
- the front wall 13 has an orifice 16 of any geometric shape. The orifice diametrically opposes the rear diaphragm 18 and connects the internal chamber 14 to an external environment having ambient fluid 39 .
- the flexible diaphragm 18 may be controlled to move by any suitable control system 24 .
- the diaphragm 18 may be equipped with a metal layer, and a metal electrode may be disposed adjacent to, but spaced from, the metal layer so that the diaphragm 18 can be moved via an electrical bias imposed between the electrode and the metal layer.
- the generation of the electrical bias can be controlled by any suitable device, for example but not limited to, a computer, logic processor, or signal generator.
- the control system 24 can cause the diaphragm 18 to move periodically, or modulate in time-harmonic motion, and force fluid in and out of the orifice 16 .
- FIG. 1B depicts the synthetic jet actuator 10 as the diaphragm 18 is controlled to move inward into the chamber 14 , as depicted by arrow 26 .
- the chamber 14 has its volume decreased and fluid is ejected through the orifice 16 .
- the flow separates at sharp orifice edges 30 and creates vortex sheets 32 which roll into vortices 34 and begin to move away from the orifice edges 30 in the direction indicated by arrow 36 .
- FIG. 1C depicts the synthetic jet actuator 10 as the diaphragm 18 is controlled to move outward with respect to the chamber 14 , as depicted by arrow 38 .
- the chamber 14 has its volume increased and ambient fluid 39 rushes into the chamber 14 as depicted by the set of arrows 37 .
- the diaphragm 18 is controlled by the control system 24 so that when the diaphragm 18 moves away from the chamber 14 , the vortices 34 are already removed from the orifice edges 30 and thus are not affected by the ambient fluid 39 being drawn into the chamber 14 . Meanwhile, a jet of ambient fluid 39 is synthesized by the vortices 34 creating strong entrainment of ambient fluid drawn from large distances away from the orifice 16 .
- the diaphragm 18 of the synthetic jet actuator 10 of the first exemplary embodiment comprises electrical actuation consisting of a metal layer and a metal electrode driven at a specific excitation frequency. This electrical stimulation causes the diaphragm 18 of the synthetic jet actuator 10 to oscillate, thereby modifying the internal volume of the chamber 14 of the synthetic jet actuator 10 .
- a synthetic jet actuator 40 could comprise a housing 47 defining a chamber 45 .
- the chamber volume could be altered by causing a flexible diaphragm 42 to move in time-harmonic motion due to the excitation of the diaphragm 42 by a piezoelectric actuator 41 .
- FIG. 2 is a cut-away side view of a synthetic jet actuator 40 having a housing 47 defined by a relatively-rigid circular top wall 43 , a relatively-rigid circular cylindrical side wall 44 , and a flexible diaphragm 42 forming a bottom wall of the actuator 40 .
- the side wall connects the top wall 43 to the diaphragm 42 .
- the side wall 44 and the top wall 43 are manufactured from a single piece of rigid material, such as plastic. It would, of course, also be possible to construct the walls 43 , 44 from a metallic material, or other suitably-rigid material. Additionally, the material forming the synthetic jet actuator 40 does not necessarily have to be rigid. The material could have some flexibility. One with ordinary skill in the art would readily understand the appropriate material for the synthetic jet actuator 40 based on a particular implementation.
- the top wall 43 , the flexible diaphragm 42 , and the side wall 44 form the housing 47 of a synthetic jet actuator 40 and define a chamber 45 having a volume.
- the housing 47 of this embodiment 40 comprises the shape of a cylindrical element. This configuration is not required, and the particular configuration has been selected in order to drive home the point that a synthetic jet actuator 40 can take almost any overall shape.
- an orifice 46 is formed in a portion of the side wall 44 .
- the orifice 46 fluidically connects the chamber 45 with an ambient fluid 48 .
- the particular size and shape of the orifice 46 is not critical to the present exemplary embodiment 40 .
- the orifice 46 could be in the shape of a circular opening, or of a horizontal or vertical slot in the side wall 44 .
- FIG. 3 is a plan view of the second exemplary embodiment of a synthetic jet actuator 40 , more specifically depicting the piezoelectric actuator 41 and flexible diaphragm 42 .
- FIG. 3 can be thought of as a view of the synthetic jet actuator 40 from the underside, or “bottom” of the actuator 40 .
- the diaphragm 42 is attached to the side wall 44 .
- the attachment of the diaphragm 42 to the side wall 44 is accomplished by an adhesive appropriate to the materials used to construct the diaphragm 42 and the side wall 44 .
- the diaphragm 42 could be attached to the side wall 44 by another attachment mechanism or device.
- the method of attachment is not critical to the present exemplary embodiment 40 . It is preferred, however, that the selected method of attachment result in a seal between the side wall 44 and the diaphragm 42 .
- the diaphragm 42 is preferably constructed of an elastomer or polymer material.
- An elastomer or polymer diaphragm 42 is not required in the present embodiment 40 ; however, a diaphragm constructed from these materials is preferred.
- piezoelectric actuators are comprised of a metal diaphragm coupled with a piezoelectric disc.
- a polymeric (like plastic) or elastomeric (like rubber) material for a diaphragm of the piezoelectric actuator.
- a polymeric or elastomeric diaphragm could be used in combination with a metal diaphragm to produce a hybrid diaphragm.
- An elastomer or polymer can be constructed from a number of specific materials, such as polyisoprene, polyisobutylene, polybutadiene, and/or polyurethanes.
- a diaphragm 42 constructed of an elastomer or polymer material is chosen due to its ability to be stretched and yet bounce back into its original shape without permanent deformation.
- the use of an elastomer or polymer diaphragm generally reduces the natural resonant frequency of the actuator, enabling its preferred use at low frequencies (for example, ⁇ 200 Hz). This renders the actuator operation relatively soundless.
- such a construction generally has superior reliability when compared to metal diaphragms that tend to produce larger stresses in the piezoelectric material and the adhesive that typically attaches the piezoelectric material to the metal.
- a piezoelectric actuator 41 is attached to the elastomer or polymer diaphragm 42 .
- the piezoelectric actuator 41 is preferably mounted to the diaphragm 42 by an appropriate adhesive.
- the piezoelectric actuator 41 is supplied power by electrical wiring 49 .
- the electrical wiring 49 will not only supply power to the piezoelectric actuator 41 , but will also control operation of the actuator 41 .
- the wiring 49 connects the piezoelectric actuator with a power supply and control system 50 that is preferably separate from the housing 47 of the synthetic jet actuator 40 .
- the power supply and control system 50 may be mounted on, or even in, the housing 47 of the synthetic jet actuator 40 .
- the power supply and control system causes the piezoelectric actuator 41 to vibrate.
- the vibration of the piezoelectric actuator 41 causes the diaphragm 42 to oscillate in time-harmonic motion.
- the piezoelectric actuator 41 is preferably caused to vibrate at the resonant frequency of the diaphragm 42 .
- the magnitude and frequency of the diaphragm oscillation can be controlled by causing the piezoelectric actuator to operate at different frequencies.
- One with ordinary skill in the art will readily be able to adjust the vibration of the piezoelectric actuator 41 in order to yield the desired frequency and amplitude of oscillation of the diaphragm 42 .
- the oscillation of the diaphragm 42 in the second exemplary embodiment 40 causes a synthetic jet stream 52 of fluid to form at the orifice 46 of the actuator 40 .
- the chamber 45 has its volume decreased and fluid is ejected through the orifice 46 .
- the flow separates at orifice edges and creates vortex sheets which roll up into vortices and to move away from the orifice 46 . These vortices entrain the ambient fluid 48 and use this fluid to form a synthetic jet stream 52 .
- the chamber 45 has its volume increased. This increase in volume causes a pressure gradient to form at the orifice 46 and ambient fluid 48 rushes into the chamber 45 . Then, as the diaphragm 42 oscillates back into the chamber 45 , the fluid in the chamber 45 is expelled, forming a synthetic jet stream 52 as described above.
- the synthetic jet actuators 10 , 40 described above can be used in a number of different embodiments. However, one specific adaptation of the synthetic jet actuators 10 , 40 is for what may be referred to as distributed cooling applications.
- a distributed cooling application is a situation that may call for a single synthetic jet actuator to provide a cooling synthetic jet stream to multiple locations.
- a distributed cooling application may call for a synthetic jet actuator to supply cooling fluid flow to a single location that is somewhat remote from the location of the actuator.
- these two examples are common distributed cooling applications.
- FIG. 4A depicts one embodiment of a distributed cooling synthetic jet actuator 60 .
- the exemplary embodiment of a distributed cooling synthetic jet actuator 60 has been designed as a modified form of the second exemplary embodiment 40 .
- the distributed cooling synthetic jet actuator 60 comprises a housing 47 defining an internal chamber 45 .
- the housing 47 and chamber 45 can take virtually any geometric configuration, but for purposes of discussion and understanding, the housing 47 is shown in cross-section in FIG. 4A to have a rigid side wall 44 , a rigid top wall 43 , and a diaphragm 42 that is flexible to an extent to permit movement of the diaphragm 42 inwardly and outwardly relative to the chamber 45 .
- a portion of the side wall 44 forms an orifice 46 .
- the orifice 46 can have any geometric shape.
- the distributed cooling synthetic jet actuator 60 also comprises a power supply and control system 50 connected to a piezoelectric actuator 41 on the diaphragm 42 by electrical wiring 49 .
- the power supply and control system 50 may be remote from the actuator 60 , or may be attached to the housing 47 or in the housing 47 for example.
- the exemplary distributed cooling apparatus 60 further comprises a channel, or a tube, 61 .
- the tube 61 may be of similar cross-sectional shape as that of the orifice 46 . However, it may also be desirable to have the cross-sectional shape of the tube 61 very different from the shape of the orifice 46 . For example, the use of a different cross-sectional shape may permit more effective directing of any flow emitting from the tube 61 .
- the tube 61 is formed of a preferably rigid shell 62 enclosing an inner area 63 .
- the tube 61 further comprises a proximal, or attachment end 64 and a distal, or open end 65 .
- the tube 61 is preferably constructed from a plastic material such that the tube 61 will be relatively-rigid, but still lightweight.
- the tubing 61 could be constructed from a flexible material having the ability to be formed into a shape and hold that shape.
- the tube 61 is formed into a generally serpentine shape.
- the shape of the tube 61 is not important to the principles of the present invention, and the particular shape depicted has been chosen only to illustrate the principles of the present exemplary embodiment 60 .
- the tube 61 is preferably attached to the side wall 44 of the synthetic jet actuator 60 such that the actuator orifice is fluidically coupled to the interior region 63 of the tubing 61 .
- the tubing 61 has an internal diameter equal to or greater than the diameter of the orifice 46 .
- the orifice 46 does not communicate directly with the ambient environment 48 , or in other words, the tube 61 completely covers the orifice 46 .
- the tube 61 is referred to as “attached” to the side wall 44 , it should be understood that the housing 47 and tube 61 can be created from a single piece of material.
- the actuator 40 could be positioned a distance away from the area to be cooled, such as in a centralized location.
- the tubing 61 could be shaped to direct flow through the fins of a heat sink.
- the fact that the synthetic jet actuator is not near the heat sink will generally increase the flow through the heat sink fins. Indeed, if the actuator is positioned at the entrance of a fin channel, the flow through the fin channel may be impeded by the presence of the actuator housing. This is not an issue with distributed cooling.
- the tubing 61 could either be pre-formed or flexible. If flexible, the designer could place the device 40 and then shape tube 61 as desired. This may be very beneficial for retrofit applications. However, in the most common embodiment, the tube 61 will be relatively-rigid such that the design of the overall cooling system can be fine-tuned prior to installation.
- the shape or dimensions of the tube 61 is not critical to the present exemplary embodiment 60 .
- the length and/or shape of the tube 61 may affect the performance of the distributed cooling synthetic jet actuator 60 .
- the operation of the synthetic jet actuator 40 in the distributed cooling apparatus 60 is similar to the operation of the synthetic jet actuator in the second exemplary embodiment described above.
- the piezoelectric actuator 41 is caused to vibrate at an appropriate frequency, preferably the resonant frequency of the diaphragm 42 . This vibration causes the diaphragm 42 to oscillate in time-harmonic motion.
- the diaphragm 42 moves inward relative to the internal chamber 45 , the volume of the chamber 45 is reduced, the pressure in the chamber 45 increases, creating a pressure gradient at the orifice 46 , and fluid is ejected from the orifice 46 of the synthetic jet actuator 40 .
- the flow exiting the orifice 46 is generally pulsating in nature, generally reflecting the frequency of the diaphragm 42 driven by the piezoelectric actuator 41 .
- This fluidic pulse moves into an interior region 63 of the tube 61 attached to the orifice 46 .
- fluid is drawn into the synthetic jet actuator chamber 45 from the tube interior 63 .
- fluid is again ejected from the chamber 45 into the tube interior 63 .
- FIGS. 4B and 4C depict the fluidic interaction within the interior 63 of the tube 61 during operation of the synthetic jet actuator 40 of the distributed cooling apparatus 60 .
- the entering fluid acts like a “virtual piston” 66 .
- the pulse of fluid 66 entering the interior 63 of the tube 61 compresses the fluid in the tube interior 63 , which in turn, causes fluid 67 to be expelled from the exit end 65 of the tube 61 .
- the “virtual piston” 66 moves out from the interior 63 of the tube 61 , withdrawing fluid from the tube interior 63 into the chamber 45 , thereby lowering the pressure in the tube 61 .
- This lower pressure in the tube 61 creates a pressure gradient at the tube exit end 65 , thereby drawing fluid from the ambient 48 into the tube 61 .
- the fluid at the tube attachment end 64 acts as a “virtual piston” 66 , operating in time-harmonic oscillation.
- the central portion 68 of the tube 61 acts like another synthetic jet actuator “chamber” 69 bounded by the walls 62 of the tube 61 .
- the fluid at the orifice 46 of the synthetic jet actuator 40 bounds this “chamber” 69 and acts as a virtual piston 66 to this virtual synthetic jet actuator “chamber” 69 .
- the fluid exiting and entering the orifice 46 acting as a piston 66 , creates a flow of fluid 67 emitting from the exit end 65 of the tube 61 .
- the fluid 67 exiting the tube 61 creates vortices at the exit 65 of the tube 61 . These vortices roll up and move away from the tube exit 65 . As the vortices form and move away, these vortices entrain the ambient fluid 48 in order to form a synthetic jet stream 67 at the exit 65 of the tube 61 .
- the operation of the diaphragm 42 of the synthetic jet actuator 40 could be specifically tuned to create the virtual synthetic jet actuator in the tube 61 .
- the operation of the diaphragm 42 should preferably be tuned such that the frequency of the air pulses 66 emitting from the orifice 46 of the synthetic jet actuator 40 are emitted at a resonant frequency of the tube 61 .
- the tube 61 in essence, acts as a type of Helmholtz resonator and can be operated in like manner.
- the attachment end 64 of the tube 61 acts as the closed end of a typical Helmholtz resonator, and also as the exciting force to the resonator.
- One of ordinary skill in the art can compute the resonant frequency of the tube 61 if the dimensions of the tube 61 are known. Then, the frequency and amplitude of the diaphragm 42 oscillation can be computed so that the pulses 66 emitted from the synthetic jet actuator 40 orifice 46 will excite the tube 61 at a resonant frequency. Of course, this could all be controlled automatically by an appropriate control system 50 .
- FIG. 5 is a cut-away top view of a distributed cooling synthetic jet actuator.
- the synthetic jet actuator housing 47 of the actuator 70 preferably has multiple orifices 46 a, 46 b, 46 c, 46 d, 46 e, 46 f.
- tubes 61 a, 61 b, 61 c, 61 d, 61 e, 61 f On the exterior of the housing 47 are attached a number of tubes 61 a, 61 b, 61 c, 61 d, 61 e, 61 f such that these tubes 61 a, 61 b, 61 c, 61 d, 61 e, 61 f correspond to each of the orifices 46 a, 46 b, 46 c, 46 d, 46 e, 46 f.
- the tubes 61 a, 61 b, 61 c, 61 d, 61 e, 61 f could all be configured to direct fluid flow at the same area, or in the preferred application, are formed such as to direct synthetic jet streams 52 a, 52 b, 52 c, 52 d, 52 e, 52 f at separate heated areas or objects 71 a, 71 b, 71 c, 71 d, 71 e.
- the distributed cooling apparatus it may be desirable to have a ready means of attaching the synthetic jet actuator module to another surface.
- the distributed cooling apparatus will be used in a retrofit application, there may not be a ready method of attachment.
- the synthetic jet actuator 40 could be manufactured so as to “stick-on” to a surface. This can be accomplished by applying double sided tape, foam with adhesive on both sides, or the like.
- a single synthetic jet actuator 40 may drive multiple tubes, and thereby generate multiple, distributed synthetic jet streams of fluid. This, of course, is not the only possible implementation of a multiple synthetic jet distributed cooling apparatus.
- Another exemplary embodiment may comprise multiple synthetic jet actuators driving multiple tubes, and thereby emitting multiple synthetic jet streams. The tubes of such an embodiment may be directed to different areas, different heat sink channels, or all to the same location.
- FIG. 6 An exemplary embodiment of a multiple actuator distributed cooling apparatus 80 is depicted in FIG. 6 .
- This apparatus 80 generally comprises a plurality of tubes 81 emerging from a generally rectangularly cubic housing 82 .
- the housing 82 has two “plenums” 83 formed into the housing 82 such that these two plenums 83 descend from a top surface 84 of the housing 82 .
- the two plenums 83 are spaced from the side walls 85 , 86 of the housing 82 , and do not preferably reach all the way to the bottom surface 87 of the housing 82 .
- FIG. 7 A cross-sectional side view of the multiple actuator distributed cooling apparatus 80 is depicted in FIG. 7 .
- One of the plenums 83 of the housing 82 is depicted as bound by the bottom surface 87 , a front wall 88 , and a rear wall 89 of the apparatus 82 .
- the front wall 88 and the rear wall 89 each form a pair of upper platforms 91 , 92 and a pair of lower platforms 93 , 94 .
- These platforms 91 , 92 , 93 , 94 are preferably formed from the same material as the walls 88 , 89 , and not merely adhered to the walls 88 , 89 . Of course, this is not a required feature of the multiple actuator distributed cooling apparatus 80 .
- a top wall 95 (depicted in FIG. 8 ) may be installed on the device 80 in order to seal the plenums 83 .
- FIG. 8 shows the device of FIG. 7 after having two actuators 96 , 97 positioned in the plenum 83 and a top wall 95 installed over the plenum 83 .
- a first actuator 96 rests on the upper platforms 91 , 92 and a second actuator 97 rests on the lower platforms 93 , 94 .
- These two actuators 96 , 97 preferably comprise a flexible diaphragm 98 , 99 having a piezoelectric actuator 101 , 102 mounted to the flexible diaphragm 98 , 99 .
- the preferred actuator 96 , 97 is the elastomeric or polymeric actuator described above with regard to the exemplary embodiment 40 . See FIG. 2 .
- Other actuators could be used with the apparatus 80 described herein. However, the elastomeric/polymeric actuators are preferred for their low profile design, robust actuation, and inexpensive cost.
- Power and control is supplied to the actuators 96 , 97 by electrical wiring (not depicted). These wires typically enter the housing 82 through four small channels 103 a, 103 b, 103 c (only three are depicted in FIG. 6 ) cut into both the upper and lower side walls 85 , 86 of the housing 82 . In fact, it is anticipated that the entire control electronics (not depicted) can be positioned in these channels 103 a, 103 b, 103 c. Then, only power will preferably be supplied to these channels 103 a, 103 b, 103 c and the control hardware they contain.
- the actuators 96 , 97 are preferably secured to the platforms 91 , 92 , 93 , 94 in the apparatus housing 82 . This is preferably accomplished by using a type of adhesive.
- a type of adhesive As the material of the diaphragm 98 , 99 is preferred to be an elastomer or polymer, and the preferred material of the housing 82 is a plastic, one of ordinary skill in the art will readily be able to select an appropriate adhesive, or other attachment mechanism.
- the apparatus plenums 83 are essentially divided into three parts.
- the positioning of the actuators 96 , 97 forms three separate chambers that generate three separate, but related, synthetic jet actuators.
- a first, or bottom, chamber 105 is bounded by the housing bottom wall 87 , the housing front wall 88 , the housing back wall 89 , and the second actuator 97 .
- the second chamber 106 is bounded by the first actuator 96 , the front wall 88 , the back wall 89 , and the second actuator 97 .
- the third, or top, chamber 107 is bounded by the first actuator 96 , the front wall 88 , the back wall 89 , and the top wall 95 .
- each chamber 105 , 106 , 107 has one or more orifices 108 .
- each chamber 105 , 106 , 107 has two orifices fashioned into the front wall 88 of the apparatus housing 82 .
- Each orifice is further fluidically connected to one of the tubes 81 emerging from the front wall 88 of the housing 82 .
- each chamber 105 , 106 , 107 it is not necessary that each chamber 105 , 106 , 107 have two orifices 108 and tubes 81 .
- the present exemplary embodiment 80 will also work if there are more or less than two orifices 108 and tubes 81 , or if there are different numbers for each chamber 105 , 106 , 107 .
- the tubes 81 are preferably attached to the housing 82 in generally the same horizontal plane, as depicted in FIG. 6 . For this reason, FIGS. 7 and 8 appear to only show one tube 81 (and one orifice 108 ) attached to the housing 82 at approximately a mid-point of the housing front wall 88 .
- the tubes 81 comprise an attachment end 109 , attached to the housing front wall 88 , and a fluid exit end 110 , fluidically connecting a tube interior 111 to an ambient fluid 112 .
- contoured passageways 113 are preferably used to fluidically connect each chamber 105 , 106 , 107 to the orifices 108 and tubes 81 served by that particular synthetic jet actuator.
- FIG. 10 depicts a cut-away view of the three chambers 105 , 106 , 107 and the orifices 108 a - f each chamber 105 , 106 , 107 services.
- the first chamber 105 has two orifices 108 e, 108 f;
- the second chamber 106 has two orifices 108 c, 108 d;
- the third chamber 107 has two orifices 108 a, 108 b.
- the three chambers 105 , 106 , 107 in the housing 82 are not necessarily rectangular in cross-section, but rather, are oddly-shaped so as to direct fluid to the various tubes 81 serviced by each chamber 105 , 106 , 107 .
- the tubes 81 are not necessarily attached to the housing 82 in the same horizontal plane.
- the tubes 81 to be serviced by each chamber 105 , 106 , 107 could be directly connected to the chamber 105 , 106 , 107 .
- the chambers 105 , 106 , 107 could be fashioned such that they have generally-rectangular cross-sections.
- the operation of the exemplary multiple actuator distributed cooling apparatus 80 will now be described, with specific discussion of one of the “plenums” 83 . It should be understood that the operation of the other “plenum” 83 will be similar.
- the two diaphragms 98 , 99 are caused to oscillate in time-harmonic motion by the control systems (not depicted) controlling each piezoelectric actuator 101 , 102 on each diaphragm 98 , 99 .
- the diaphragms 98 , 99 are preferably actuated such that the two diaphragms 98 , 99 oscillate out of phase with one-another.
- the second chamber 106 pushes fluid from the chamber 106 into the interior 111 of the tubes 81 connected to this chamber 106 .
- this pushing of fluid into the tube interior 111 acts like a “virtual piston” of fluid. See the description relating to FIGS. 4B and 4C above for an explanation of this process.
- This virtual piston moves into the interior 111 of the tubes 81 , compressing the fluid in the tube interior 111 , and thus causing a synthetic jet stream of fluid 115 to form at the exit end 110 of the tubes 81 connected to this second chamber 106 .
- the top chamber 107 and bottom chamber 105 undergo the opposite effect. Specifically, as the two diaphragms 98 , 99 move toward one-another, both the top and bottom chambers 107 , 105 pull fluid in from the interior 111 of the tubes 81 connected to these chambers 107 , 105 . This moves the “virtual piston” of fluid into the top and bottom chambers 107 , 105 , thereby causing the exit end 110 of the tubes 81 connected to these chambers 107 , 105 to draw fluid in from the ambient 112 .
- the second chamber's volume increases and fluid is pulled into the tubes 81 connected to this chamber 106 from the ambient 112 .
- the volumes of the top and bottom chambers 107 , 105 are similarly reduced. This causes a synthetic jet stream 115 of fluid to form at the exit ends 110 of the tubes 81 connected to these two chambers 107 , 105 .
- the principle of operation of the multiple actuator distributed cooling apparatus 80 is very similar to the operation of the basic distributed cooling apparatus 60 described above.
- the tubes 81 of this embodiment 80 act as Helmholtz resonators in the manner described above with regard to the single actuator distributed cooling apparatus 60 .
- FIGS. 11A and 11B One common implementation 120 of a multiple actuator distributed cooling apparatus 80 is depicted in FIGS. 11A and 11B .
- This exemplary implementation 120 is not limiting on the range of implementations for the apparatus 80 .
- An exemplary implementation is presented merely to better illustrate the features of the present embodiment 80 .
- the exemplary implementation 120 involves the use of an extruded heat sink 121 for transporting heat away from a heated object 122 .
- the multiple actuator distributed cooling apparatus 80 is positioned such that each of the tubes 81 in the apparatus 80 are aligned with a series of channels 123 formed with a series of fins 124 of the heat sink 121 such that the flow 125 of the jet passes through the channels 123 between the fins 124 .
- This jet flow 125 in turn entrains secondary cool airflow 126 that is forced into the channels 123 of the heat sink 121 .
- FIG. 12A depicts the situation without a synthetic jet actuator 80 .
- the fan 128 draws fluid flow 127 though the channels 123 between the fins 124 of a heat sink 121 .
- a large portion of the airflow 130 bypasses the heat sink 121 . This is a common problem encountered in several applications like blade servers, telecom racks and the like, where the spacing between the component boards is narrow and there are large banks of fans attempting to drive massive airflow through the heat sink mounted on the hot components.
- a synthetic jet actuator is positioned such that the tubes 81 of the actuator 80 are directed to empty their flow 115 into the channels 123 of the heat sink 121 .
- the actuator can be positioned below the plane of the heat sink 121 , thereby preventing any interference with the flow.
- a tangential synthetic jet 115 is directed near the left edge of the heat sink 121 .
- the fan 128 continues to operate.
- the low-pressure, high momentum synthetic jet enables a significant entrainment 131 of the airflow 130 that was previously bypassing the heat sink 121 .
Abstract
One embodiment of the device comprises a device for thermal management. More particularly, one embodiment comprises a synthetic jet actuator (60) and a tube (61). The synthetic jet actuator (60), though not required, typically comprises a housing (47) defining an internal chamber (45) and having an orifice (46) in a wall (44) of the housing (47). The synthetic jet actuator (60) typically also comprises a flexible diaphragm (42) forming a portion of the housing (47). The tube (61) of this exemplary embodiment typically comprises a proximal end (64) and a distal end (65), the proximal end (64) being positioned adjacent to the synthetic jet actuator (60). In this embodiment, operation of the synthetic jet actuator (60) causes a synthetic jet stream (52) to form at the distal end (65) of the tube (61).
Description
- The present invention is generally related to thermal management technology and, more particularly, is related to a system and method for cooling heat-producing bodies or components using distributed synthetic jet actuators.
- Cooling of heat-producing bodies is a concern in many different technologies. Particularly in microprocessors, the rise in heat dissipation levels accompanied by a shrinking thermal budget has resulted in the need for new cooling solutions beyond conventional thermal management techniques. Moreover, there is a greatly increased demand for effective thermal management strategies to be used within small handheld devices, such as portable digital assistants (PDA's), mobile phones, portable CD players, and similar consumer products. Indeed, thermal management is a major challenge in the design and packaging of state-of-the-art integrated circuits in single-chip and multi-chip modules.
- Traditionally, the need for cooling large microelectronic devices has been met by using forced convection air cooling techniques. Forced convection can be implemented either with or without heat sinks. Conventionally, fans are employed to provide either global cooling or local cooling.
- Fans are capable of supplying ample volume flow rate, but there are several distinct disadvantages to using a fan. Fans are relatively inefficient in terms of the heat removed for a given volume flow rate. In addition, the use of fans to globally or locally cool a heated environment often results in electromagnetic interference and noise generated by the magnetic-based fan motor. Use of a fan also requires a relatively large number of moving parts in order to have any success in cooling a heated body or microelectronic component. For this or other reasons, fans may be hindered by long-term reliability.
- Mobile applications introduce the added complication of space constraints that might be difficult to achieve with fans, while at the same time increased thermal management requirements have necessitated larger fans driving higher flow rates. Since the power dissipation requirements have necessitated placing fans directly on the heat sink in some instances, the associated noise levels due to the flow-structure interaction have become an additional concern.
- In some instances, as in handhelds like portable digital assistants (“PDAs”), cell phones, etc., the need for thermal management has been met by employing a strategy of spreading the heat produced through the use of heat spreaders to the outer shell of the handheld. Subsequently, the heat generated is dissipated though the outer shell, or skin, of the device via natural convection.
- While these approaches are common, they offer certain drawbacks that will be exacerbated as new products that produce even more heat are developed. The difficulty with the heat spreading strategy is simply that it is often ineffective at removing adequate quantities of heat. Additionally, the heat dissipated may result in raising the temperature of the casing of the handheld device, which is not desirable from a consumer use ergonomic standpoint.
- In an effort to remedy some of the limitations of previous cooling techniques, the use of synthetic or “zero-net-mass-flux” jet actuators in thermal management has been explored. For example, U.S. Pat. No. 6,123,145 discusses the use of synthetic jet actuators for use in cooling. U.S. Pat. No. 6,123,145 is hereby incorporated by reference in its entirety, as if fully set forth herein. Unlike conventional jets, synthetic jet actuators require no mass addition to the system, and thus provide a compact way of efficiently directing airflow across a heated surface. Because the jet streams are generated entirely from the ambient fluid, they can be conveniently integrated without the need for complex plumbing.
- As a further example of the development of thermal management techniques with synthetic jet actuators, Glezer and Mahalingam developed an apparatus and device for channel cooling. This apparatus and method is described in U.S. Pat. No. 6,588,497, which is hereby incorporated by reference in its entirety, as if fully set forth herein.
- While the techniques described in the afore-mentioned U.S. patents solve some of the limitations in the industry, there is an ever-increasing need for improving even the aforementioned techniques. For example, there is a need for a more effective, efficient, or compact synthetic jet actuator. It is desirable to have a more compact cooling device. On the other hand, there is also a need to distribute the cooling flow to far-reaching parts of a heated environment.
- Thus, a heretoforeunaddressed need exists in the industry to address the aforementioned deficiencies and inadequacies.
- Embodiments of the present invention provide a device for thermal management in various environments. More specifically, the present embodiments include devices for cooling an area or device through the use of synthetic jet actuators in a distributed cooling apparatus.
- Briefly described, in architecture, one embodiment of the device, among others, can be implemented as a device for thermal management comprising a synthetic jet actuator and a channel. The channel of this exemplary embodiment typically comprises a proximal end and a distal end, the proximal end being positioned adjacent to the synthetic jet actuator. Operation of the synthetic jet actuator preferably causes a synthetic jet stream to form at the distal end of the channel. Of course, the synthetic jet stream may also form at the proximal end of the channel.
- The synthetic jet actuator of this or other exemplary embodiments, though not required, may comprise a housing defining an internal chamber and having at least one orifice in a wall of the housing. The synthetic jet actuator of this embodiment also preferably comprises a device for changing the volume of the internal chamber, wherein the volume changing device is preferably positioned adjacent to the housing. In some embodiments, the device for changing the volume may actually make up a portion of the synthetic jet actuator housing. For example, the volume changing device of some exemplary embodiments comprises a flexible diaphragm forming a portion of the synthetic jet actuator housing.
- In some exemplary embodiments, the channel is comprised of one or more tubes connected to an external surface of a wall of the synthetic jet actuator housing. In these exemplary embodiments the tube (or tubes) typically encloses at least a portion of a synthetic jet actuator orifice.
- Other systems, methods, features, and advantages of the present invention will be or become apparent to one with skill in the art upon examination of the following drawings and detailed description. It is intended that all such additional systems, methods, features, and advantages be included within this description, be within the scope of the present invention, and be protected by the accompanying claims.
- Many aspects of the invention can be better understood with reference to the following drawings. The components in the drawings are not necessarily to scale, emphasis instead being placed upon clearly illustrating the principles of the present invention. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
-
FIG. 1A is a schematic cross-sectional side view of a first exemplary embodiment zero net mass flux synthetic jet actuator with a control system. -
FIG. 1B is a schematic cross-sectional side view of the synthetic jet actuator ofFIG. 1A depicting the jet as the control system causes the diaphragm to travel inward, toward the orifice. -
FIG. 1C is a schematic cross-sectional side view of the synthetic jet actuator ofFIG. 1A depicting the jet as the control system causes the diaphragm to travel outward, away from the orifice. -
FIG. 2 is a cross-sectional side view of a second exemplary embodiment of a synthetic jet actuator. -
FIG. 3 is a bottom view of the second exemplary embodiment of a synthetic jet actuator ofFIG. 2 . -
FIG. 4A is a cross-sectional side view of a distributed cooling apparatus. -
FIG. 4B is a cross-sectional side view of the tube used in the distributed cooling apparatus ofFIG. 4A as the tube withdraws fluid from an ambient. -
FIG. 4C is a cross-sectional side view of the tube used in the distributed cooling apparatus ofFIG. 4A as the tube creates a synthetic jet stream of fluid at an exit end of the tube. -
FIG. 5 is a cross-sectional top view of a distributed cooling apparatus for directing fluid flow to different areas of a heated environment. -
FIG. 6 is a three-dimensional view of a multiple actuator distributed cooling apparatus. -
FIG. 7 is a cross-sectional side view of the multiple actuator distributed cooling apparatus ofFIG. 6 , focussing on one of the “plenums” of the multiple actuator distributed cooling apparatus. -
FIG. 8 is a cross-sectional side view of the multiple actuator distributed cooling apparatus ofFIG. 6 , focussing on one of the “plenums” of the apparatus, where actuators have been installed into the “plenum.” -
FIG. 9 is a three-dimensional, cut-away view of the multiple actuator distributed cooling apparatus ofFIG. 6 . -
FIG. 10 is a cut-away schematic rear view of the multiple actuator distributed cooling apparatus ofFIG. 6 . -
FIG. 11A is a side view of the multiple actuator distributed cooling apparatus ofFIG. 6 implemented into a cooling system. -
FIG. 11B is a front view of the multiple actuator distributed cooling apparatus ofFIG. 6 implemented into a cooling system. -
FIG. 12A is a side view of a prior art cooling system. -
FIG. 12B is a side view of the cooling system ofFIG. 12A wherein the multiple actuator distributed cooling apparatus ofFIG. 6 has been implemented into the cooling system. - I. Synthetic Jet Actuators
- A. Basic Design of a Typical Synthetic Jet Actuator
-
FIG. 1A depicts an example of asynthetic jet actuator 10 comprising ahousing 11 defining and enclosing aninternal chamber 14. Thehousing 11 andchamber 14 can take virtually any geometric configuration, but for purposes of discussion and understanding, thehousing 11 is shown in cross-section inFIG. 1A to have arigid side wall 12, a rigidfront wall 13, and arear diaphragm 18 that is flexible to an extent to permit movement of thediaphragm 18 inwardly and outwardly relative to thechamber 14. Thefront wall 13 has anorifice 16 of any geometric shape. The orifice diametrically opposes therear diaphragm 18 and connects theinternal chamber 14 to an external environment havingambient fluid 39. - The
flexible diaphragm 18 may be controlled to move by anysuitable control system 24. For example, thediaphragm 18 may be equipped with a metal layer, and a metal electrode may be disposed adjacent to, but spaced from, the metal layer so that thediaphragm 18 can be moved via an electrical bias imposed between the electrode and the metal layer. Moreover, the generation of the electrical bias can be controlled by any suitable device, for example but not limited to, a computer, logic processor, or signal generator. Thecontrol system 24 can cause thediaphragm 18 to move periodically, or modulate in time-harmonic motion, and force fluid in and out of theorifice 16. - The operation of the example
synthetic jet actuator 10 will now be described with reference toFIGS. 1B and 1C .FIG. 1B depicts thesynthetic jet actuator 10 as thediaphragm 18 is controlled to move inward into thechamber 14, as depicted byarrow 26. Thechamber 14 has its volume decreased and fluid is ejected through theorifice 16. As the fluid exits thechamber 14 through theorifice 16, the flow separates at sharp orifice edges 30 and createsvortex sheets 32 which roll intovortices 34 and begin to move away from the orifice edges 30 in the direction indicated byarrow 36. -
FIG. 1C depicts thesynthetic jet actuator 10 as thediaphragm 18 is controlled to move outward with respect to thechamber 14, as depicted by arrow 38. Thechamber 14 has its volume increased and ambient fluid 39 rushes into thechamber 14 as depicted by the set ofarrows 37. Thediaphragm 18 is controlled by thecontrol system 24 so that when thediaphragm 18 moves away from thechamber 14, thevortices 34 are already removed from the orifice edges 30 and thus are not affected by theambient fluid 39 being drawn into thechamber 14. Meanwhile, a jet ofambient fluid 39 is synthesized by thevortices 34 creating strong entrainment of ambient fluid drawn from large distances away from theorifice 16. - B. Synthetic Jet Actuator Having a Hybrid Piezoelectric Actuator
- As explained above, the
diaphragm 18 of thesynthetic jet actuator 10 of the first exemplary embodiment comprises electrical actuation consisting of a metal layer and a metal electrode driven at a specific excitation frequency. This electrical stimulation causes thediaphragm 18 of thesynthetic jet actuator 10 to oscillate, thereby modifying the internal volume of thechamber 14 of thesynthetic jet actuator 10. - Alternatively, as depicted in
FIG. 2 , asynthetic jet actuator 40 could comprise ahousing 47 defining achamber 45. The chamber volume could be altered by causing aflexible diaphragm 42 to move in time-harmonic motion due to the excitation of thediaphragm 42 by apiezoelectric actuator 41.FIG. 2 is a cut-away side view of asynthetic jet actuator 40 having ahousing 47 defined by a relatively-rigid circulartop wall 43, a relatively-rigid circularcylindrical side wall 44, and aflexible diaphragm 42 forming a bottom wall of theactuator 40. As depicted in the figure, the side wall connects thetop wall 43 to thediaphragm 42. Preferably, theside wall 44 and thetop wall 43 are manufactured from a single piece of rigid material, such as plastic. It would, of course, also be possible to construct thewalls synthetic jet actuator 40 does not necessarily have to be rigid. The material could have some flexibility. One with ordinary skill in the art would readily understand the appropriate material for thesynthetic jet actuator 40 based on a particular implementation. - As noted above, the
top wall 43, theflexible diaphragm 42, and theside wall 44 form thehousing 47 of asynthetic jet actuator 40 and define achamber 45 having a volume. Thehousing 47 of thisembodiment 40 comprises the shape of a cylindrical element. This configuration is not required, and the particular configuration has been selected in order to drive home the point that asynthetic jet actuator 40 can take almost any overall shape. - In this embodiment of a
synthetic jet actuator 40, anorifice 46 is formed in a portion of theside wall 44. Theorifice 46 fluidically connects thechamber 45 with anambient fluid 48. The particular size and shape of theorifice 46 is not critical to the presentexemplary embodiment 40. By way of example, theorifice 46 could be in the shape of a circular opening, or of a horizontal or vertical slot in theside wall 44. -
FIG. 3 is a plan view of the second exemplary embodiment of asynthetic jet actuator 40, more specifically depicting thepiezoelectric actuator 41 andflexible diaphragm 42. In other words,FIG. 3 can be thought of as a view of thesynthetic jet actuator 40 from the underside, or “bottom” of theactuator 40. As can be seen from the figure, thediaphragm 42 is attached to theside wall 44. Preferably, the attachment of thediaphragm 42 to theside wall 44 is accomplished by an adhesive appropriate to the materials used to construct thediaphragm 42 and theside wall 44. Alternatively, thediaphragm 42 could be attached to theside wall 44 by another attachment mechanism or device. The method of attachment is not critical to the presentexemplary embodiment 40. It is preferred, however, that the selected method of attachment result in a seal between theside wall 44 and thediaphragm 42. - The
diaphragm 42 is preferably constructed of an elastomer or polymer material. An elastomer orpolymer diaphragm 42 is not required in thepresent embodiment 40; however, a diaphragm constructed from these materials is preferred. Conventionally, piezoelectric actuators are comprised of a metal diaphragm coupled with a piezoelectric disc. However, it may be advantageous in certain implementations to use a polymeric (like plastic) or elastomeric (like rubber) material for a diaphragm of the piezoelectric actuator. Alternatively, a polymeric or elastomeric diaphragm could be used in combination with a metal diaphragm to produce a hybrid diaphragm. - An elastomer or polymer can be constructed from a number of specific materials, such as polyisoprene, polyisobutylene, polybutadiene, and/or polyurethanes. For the
present embodiment 40, adiaphragm 42 constructed of an elastomer or polymer material is chosen due to its ability to be stretched and yet bounce back into its original shape without permanent deformation. - There are at least two advantages to such a modified actuator construction. First, the use of an elastomer or polymer diaphragm generally reduces the natural resonant frequency of the actuator, enabling its preferred use at low frequencies (for example, <200 Hz). This renders the actuator operation relatively soundless. Second, such a construction generally has superior reliability when compared to metal diaphragms that tend to produce larger stresses in the piezoelectric material and the adhesive that typically attaches the piezoelectric material to the metal.
- As noted above, a
piezoelectric actuator 41 is attached to the elastomer orpolymer diaphragm 42. Thepiezoelectric actuator 41 is preferably mounted to thediaphragm 42 by an appropriate adhesive. Thepiezoelectric actuator 41 is supplied power byelectrical wiring 49. Theelectrical wiring 49 will not only supply power to thepiezoelectric actuator 41, but will also control operation of theactuator 41. Specifically, thewiring 49 connects the piezoelectric actuator with a power supply andcontrol system 50 that is preferably separate from thehousing 47 of thesynthetic jet actuator 40. Of course, in certain embodiments, the power supply andcontrol system 50 may be mounted on, or even in, thehousing 47 of thesynthetic jet actuator 40. - The power supply and control system causes the
piezoelectric actuator 41 to vibrate. The vibration of thepiezoelectric actuator 41 causes thediaphragm 42 to oscillate in time-harmonic motion. Thepiezoelectric actuator 41 is preferably caused to vibrate at the resonant frequency of thediaphragm 42. Of course, the magnitude and frequency of the diaphragm oscillation can be controlled by causing the piezoelectric actuator to operate at different frequencies. One with ordinary skill in the art will readily be able to adjust the vibration of thepiezoelectric actuator 41 in order to yield the desired frequency and amplitude of oscillation of thediaphragm 42. - As noted above with respect to the first
exemplary embodiment 10, the oscillation of thediaphragm 42 in the secondexemplary embodiment 40 causes asynthetic jet stream 52 of fluid to form at theorifice 46 of theactuator 40. As thediaphragm 42 moves inward with respect to thechamber 45, thechamber 45 has its volume decreased and fluid is ejected through theorifice 46. As the fluid exits thechamber 45 through theorifice 46, the flow separates at orifice edges and creates vortex sheets which roll up into vortices and to move away from theorifice 46. These vortices entrain theambient fluid 48 and use this fluid to form asynthetic jet stream 52. - Similar to the operation of the first exemplary
synthetic jet actuator 10, when thediaphragm 42 is caused to move outward with respect to thechamber 45, thechamber 45 has its volume increased. This increase in volume causes a pressure gradient to form at theorifice 46 and ambient fluid 48 rushes into thechamber 45. Then, as thediaphragm 42 oscillates back into thechamber 45, the fluid in thechamber 45 is expelled, forming asynthetic jet stream 52 as described above. - III. Distributed Cooling Apparatus
- The
synthetic jet actuators synthetic jet actuators -
FIG. 4A depicts one embodiment of a distributed coolingsynthetic jet actuator 60. For ease of explanation, the exemplary embodiment of a distributed coolingsynthetic jet actuator 60 has been designed as a modified form of the secondexemplary embodiment 40. As such, the distributed coolingsynthetic jet actuator 60 comprises ahousing 47 defining aninternal chamber 45. Thehousing 47 andchamber 45 can take virtually any geometric configuration, but for purposes of discussion and understanding, thehousing 47 is shown in cross-section inFIG. 4A to have arigid side wall 44, a rigidtop wall 43, and adiaphragm 42 that is flexible to an extent to permit movement of thediaphragm 42 inwardly and outwardly relative to thechamber 45. A portion of theside wall 44 forms anorifice 46. As above, theorifice 46 can have any geometric shape. - As with the
exemplary embodiment 40 above, the distributed coolingsynthetic jet actuator 60 also comprises a power supply andcontrol system 50 connected to apiezoelectric actuator 41 on thediaphragm 42 byelectrical wiring 49. As above, the power supply andcontrol system 50 may be remote from theactuator 60, or may be attached to thehousing 47 or in thehousing 47 for example. - The exemplary distributed
cooling apparatus 60 further comprises a channel, or a tube, 61. Thetube 61 may be of similar cross-sectional shape as that of theorifice 46. However, it may also be desirable to have the cross-sectional shape of thetube 61 very different from the shape of theorifice 46. For example, the use of a different cross-sectional shape may permit more effective directing of any flow emitting from thetube 61. Thetube 61 is formed of a preferablyrigid shell 62 enclosing aninner area 63. Thetube 61 further comprises a proximal, orattachment end 64 and a distal, oropen end 65. Thetube 61 is preferably constructed from a plastic material such that thetube 61 will be relatively-rigid, but still lightweight. Alternatively, thetubing 61 could be constructed from a flexible material having the ability to be formed into a shape and hold that shape. InFIG. 4A , thetube 61 is formed into a generally serpentine shape. The shape of thetube 61 is not important to the principles of the present invention, and the particular shape depicted has been chosen only to illustrate the principles of the presentexemplary embodiment 60. - As shown in the figure, the
tube 61 is preferably attached to theside wall 44 of thesynthetic jet actuator 60 such that the actuator orifice is fluidically coupled to theinterior region 63 of thetubing 61. In the preferred configuration, thetubing 61 has an internal diameter equal to or greater than the diameter of theorifice 46. Thus, theorifice 46 does not communicate directly with theambient environment 48, or in other words, thetube 61 completely covers theorifice 46. Although thetube 61 is referred to as “attached” to theside wall 44, it should be understood that thehousing 47 andtube 61 can be created from a single piece of material. - As will be explained in more detail below, during operation, vortices form at the edges of the
tubing exit end 65. These vortices roll up and move away from the exit of thetube 61. These vortices entrainambient fluid 48 forming afluidic jet 52 at theexit 65 of thetube 61. In essence, the use oftubing 61 permits a jet offluid 52 to eject from thetubing 61, away from the actuator itself. Basically, the synthetic jet of fluid that would be emitted from theorifice 46 of the synthetic jet actuator, if notube 61 was present, is emitted instead from the exit end 65 of thetube 61. This feature of thepresent embodiment 60 permits a designer of a cooling system to position thesynthetic jet actuator 40 at any convenient location, but still direct thefluid flow 52 to a relatively-distant location by simply directing thetube 61 to this desired location. - For example, the
actuator 40 could be positioned a distance away from the area to be cooled, such as in a centralized location. Thetubing 61 could be shaped to direct flow through the fins of a heat sink. The fact that the synthetic jet actuator is not near the heat sink will generally increase the flow through the heat sink fins. Indeed, if the actuator is positioned at the entrance of a fin channel, the flow through the fin channel may be impeded by the presence of the actuator housing. This is not an issue with distributed cooling. - As noted above, the
tubing 61 could either be pre-formed or flexible. If flexible, the designer could place thedevice 40 and then shapetube 61 as desired. This may be very beneficial for retrofit applications. However, in the most common embodiment, thetube 61 will be relatively-rigid such that the design of the overall cooling system can be fine-tuned prior to installation. - As noted above, the shape or dimensions of the
tube 61 is not critical to the presentexemplary embodiment 60. However, the length and/or shape of thetube 61 may affect the performance of the distributed coolingsynthetic jet actuator 60. To better explain this point, resort should be made to the operation of the distributed coolingapparatus 60. - The operation of the
synthetic jet actuator 40 in the distributed coolingapparatus 60 is similar to the operation of the synthetic jet actuator in the second exemplary embodiment described above. Specifically, thepiezoelectric actuator 41 is caused to vibrate at an appropriate frequency, preferably the resonant frequency of thediaphragm 42. This vibration causes thediaphragm 42 to oscillate in time-harmonic motion. As thediaphragm 42 moves inward relative to theinternal chamber 45, the volume of thechamber 45 is reduced, the pressure in thechamber 45 increases, creating a pressure gradient at theorifice 46, and fluid is ejected from theorifice 46 of thesynthetic jet actuator 40. Because there is no ambient fluid to entrain at theorifice 46, the flow exiting theorifice 46 is generally pulsating in nature, generally reflecting the frequency of thediaphragm 42 driven by thepiezoelectric actuator 41. This fluidic pulse moves into aninterior region 63 of thetube 61 attached to theorifice 46. As thediaphragm 42 is moved outward with respect to thechamber 45, fluid is drawn into the syntheticjet actuator chamber 45 from thetube interior 63. Then, as thediaphragm 42 continues its time-harmonic oscillation and moves back into thechamber 45, fluid is again ejected from thechamber 45 into thetube interior 63. -
FIGS. 4B and 4C depict the fluidic interaction within theinterior 63 of thetube 61 during operation of thesynthetic jet actuator 40 of the distributed coolingapparatus 60. When the fluid from the syntheticjet actuator chamber 45 enters the interior 63 of thetube 61, the entering fluid acts like a “virtual piston” 66. The pulse offluid 66 entering the interior 63 of thetube 61 compresses the fluid in thetube interior 63, which in turn, causes fluid 67 to be expelled from the exit end 65 of thetube 61. When thediaphragm 42 moves outward from the syntheticjet actuator chamber 45, the “virtual piston” 66 moves out from theinterior 63 of thetube 61, withdrawing fluid from thetube interior 63 into thechamber 45, thereby lowering the pressure in thetube 61. This lower pressure in thetube 61 creates a pressure gradient at thetube exit end 65, thereby drawing fluid from the ambient 48 into thetube 61. Again, the fluid at the tube attachment end 64 acts as a “virtual piston” 66, operating in time-harmonic oscillation. - The
central portion 68 of thetube 61 acts like another synthetic jet actuator “chamber” 69 bounded by thewalls 62 of thetube 61. The fluid at theorifice 46 of thesynthetic jet actuator 40 bounds this “chamber” 69 and acts as avirtual piston 66 to this virtual synthetic jet actuator “chamber” 69. The fluid exiting and entering theorifice 46, acting as apiston 66, creates a flow offluid 67 emitting from the exit end 65 of thetube 61. The fluid 67 exiting thetube 61 creates vortices at theexit 65 of thetube 61. These vortices roll up and move away from thetube exit 65. As the vortices form and move away, these vortices entrain theambient fluid 48 in order to form asynthetic jet stream 67 at theexit 65 of thetube 61. - Depending on the length of the
tube 61, the operation of thediaphragm 42 of thesynthetic jet actuator 40 could be specifically tuned to create the virtual synthetic jet actuator in thetube 61. As is apparent from the discussion above, and as will be recognized by one of ordinary skill in the art, the operation of thediaphragm 42 should preferably be tuned such that the frequency of theair pulses 66 emitting from theorifice 46 of thesynthetic jet actuator 40 are emitted at a resonant frequency of thetube 61. Thetube 61, in essence, acts as a type of Helmholtz resonator and can be operated in like manner. Theattachment end 64 of thetube 61 acts as the closed end of a typical Helmholtz resonator, and also as the exciting force to the resonator. - One of ordinary skill in the art can compute the resonant frequency of the
tube 61 if the dimensions of thetube 61 are known. Then, the frequency and amplitude of thediaphragm 42 oscillation can be computed so that thepulses 66 emitted from thesynthetic jet actuator 40orifice 46 will excite thetube 61 at a resonant frequency. Of course, this could all be controlled automatically by anappropriate control system 50. - In another exemplary configuration of a distributed cooling
synthetic jet actuator 70, thesynthetic jet actuator 40 is configured to drive a number of tubes. Such a configuration is depicted inFIG. 5 .FIG. 5 is a cut-away top view of a distributed cooling synthetic jet actuator. As shown, the syntheticjet actuator housing 47 of theactuator 70 preferably hasmultiple orifices housing 47 are attached a number oftubes tubes orifices tubes synthetic jet streams - In another embodiment of the distributed cooling apparatus, it may be desirable to have a ready means of attaching the synthetic jet actuator module to another surface. For example, if the distributed cooling apparatus will be used in a retrofit application, there may not be a ready method of attachment. In such a situation, it may be desirable to have the
top wall 43 of thesynthetic jet actuator 40 configured such as to readily adhere to a surface. Thesynthetic jet actuator 40 could be manufactured so as to “stick-on” to a surface. This can be accomplished by applying double sided tape, foam with adhesive on both sides, or the like. - In some implementations of a distributed cooling apparatus, it may be desirable to generate multiple synthetic jet streams. As noted above, a single
synthetic jet actuator 40 may drive multiple tubes, and thereby generate multiple, distributed synthetic jet streams of fluid. This, of course, is not the only possible implementation of a multiple synthetic jet distributed cooling apparatus. Another exemplary embodiment may comprise multiple synthetic jet actuators driving multiple tubes, and thereby emitting multiple synthetic jet streams. The tubes of such an embodiment may be directed to different areas, different heat sink channels, or all to the same location. - An exemplary embodiment of a multiple actuator distributed cooling
apparatus 80 is depicted inFIG. 6 . Thisapparatus 80 generally comprises a plurality oftubes 81 emerging from a generally rectangularlycubic housing 82. Thehousing 82 has two “plenums” 83 formed into thehousing 82 such that these twoplenums 83 descend from atop surface 84 of thehousing 82. The twoplenums 83 are spaced from theside walls housing 82, and do not preferably reach all the way to thebottom surface 87 of thehousing 82. - A cross-sectional side view of the multiple actuator distributed cooling
apparatus 80 is depicted inFIG. 7 . One of theplenums 83 of thehousing 82 is depicted as bound by thebottom surface 87, afront wall 88, and arear wall 89 of theapparatus 82. Thefront wall 88 and therear wall 89 each form a pair ofupper platforms lower platforms platforms walls walls apparatus 80. In addition, a top wall 95 (depicted inFIG. 8 ) may be installed on thedevice 80 in order to seal theplenums 83. -
FIG. 8 shows the device ofFIG. 7 after having twoactuators plenum 83 and atop wall 95 installed over theplenum 83. As depicted in the figure, afirst actuator 96 rests on theupper platforms second actuator 97 rests on thelower platforms actuators flexible diaphragm piezoelectric actuator flexible diaphragm preferred actuator exemplary embodiment 40. SeeFIG. 2 . Other actuators could be used with theapparatus 80 described herein. However, the elastomeric/polymeric actuators are preferred for their low profile design, robust actuation, and inexpensive cost. - Power and control is supplied to the
actuators housing 82 through foursmall channels FIG. 6 ) cut into both the upper andlower side walls housing 82. In fact, it is anticipated that the entire control electronics (not depicted) can be positioned in thesechannels channels - The
actuators platforms apparatus housing 82. This is preferably accomplished by using a type of adhesive. As the material of thediaphragm housing 82 is a plastic, one of ordinary skill in the art will readily be able to select an appropriate adhesive, or other attachment mechanism. - Once the
actuators apparatus housing 82, theapparatus plenums 83 are essentially divided into three parts. The positioning of theactuators chamber 105 is bounded by thehousing bottom wall 87, thehousing front wall 88, the housing backwall 89, and thesecond actuator 97. Thesecond chamber 106 is bounded by thefirst actuator 96, thefront wall 88, theback wall 89, and thesecond actuator 97. The third, or top,chamber 107 is bounded by thefirst actuator 96, thefront wall 88, theback wall 89, and thetop wall 95. - Recall that the above implementation of a distributed cooling apparatus 60 (
FIG. 4A ) had asingle orifice 46 leading from achamber 45 to asingle tube 61. However, in the presentexemplary embodiment 80, eachchamber exemplary embodiment 80, eachchamber front wall 88 of theapparatus housing 82. Each orifice is further fluidically connected to one of thetubes 81 emerging from thefront wall 88 of thehousing 82. Of course, it is not necessary that eachchamber orifices 108 andtubes 81. The presentexemplary embodiment 80 will also work if there are more or less than twoorifices 108 andtubes 81, or if there are different numbers for eachchamber - The
tubes 81 are preferably attached to thehousing 82 in generally the same horizontal plane, as depicted inFIG. 6 . For this reason,FIGS. 7 and 8 appear to only show one tube 81 (and one orifice 108) attached to thehousing 82 at approximately a mid-point of thehousing front wall 88. Thetubes 81 comprise anattachment end 109, attached to thehousing front wall 88, and afluid exit end 110, fluidically connecting atube interior 111 to anambient fluid 112. - Because the
tubes 81 are preferably all attached to thehousing 82 in the same horizontal plane, and thechambers passageways 113 are preferably used to fluidically connect eachchamber orifices 108 andtubes 81 served by that particular synthetic jet actuator. - These ported
passageways 113 are depicted in the cut-away sectional view ofFIG. 9 . Furthermore,FIG. 10 depicts a cut-away view of the threechambers orifices 108 a-f eachchamber FIG. 10 , thefirst chamber 105 has twoorifices second chamber 106 has twoorifices third chamber 107 has twoorifices FIGS. 9 and 10 , the threechambers housing 82 are not necessarily rectangular in cross-section, but rather, are oddly-shaped so as to direct fluid to thevarious tubes 81 serviced by eachchamber - Of course, in an alternative embodiment, the
tubes 81 are not necessarily attached to thehousing 82 in the same horizontal plane. For example, thetubes 81 to be serviced by eachchamber chamber chambers - The operation of the exemplary multiple actuator distributed cooling
apparatus 80 will now be described, with specific discussion of one of the “plenums” 83. It should be understood that the operation of the other “plenum” 83 will be similar. In operation, the twodiaphragms piezoelectric actuator diaphragm diaphragms diaphragms - As the two
actuators second chamber 106 is reduced, and the volumes of thetop chamber 107 andbottom chamber 105 are increased. Therefore, thesecond chamber 106 pushes fluid from thechamber 106 into theinterior 111 of thetubes 81 connected to thischamber 106. Recall from the discussion relative to the single actuatorexemplary embodiment 60 above, this pushing of fluid into the tube interior 111 acts like a “virtual piston” of fluid. See the description relating toFIGS. 4B and 4C above for an explanation of this process. This virtual piston moves into theinterior 111 of thetubes 81, compressing the fluid in thetube interior 111, and thus causing a synthetic jet stream offluid 115 to form at theexit end 110 of thetubes 81 connected to thissecond chamber 106. - The
top chamber 107 andbottom chamber 105 undergo the opposite effect. Specifically, as the twodiaphragms bottom chambers interior 111 of thetubes 81 connected to thesechambers bottom chambers exit end 110 of thetubes 81 connected to thesechambers - As the
diaphragms tubes 81 connected to thischamber 106 from the ambient 112. Of course, the volumes of the top andbottom chambers synthetic jet stream 115 of fluid to form at the exit ends 110 of thetubes 81 connected to these twochambers - As will be recognized by one of ordinary skill in the art, the principle of operation of the multiple actuator distributed cooling
apparatus 80 is very similar to the operation of the basic distributed coolingapparatus 60 described above. For example, thetubes 81 of thisembodiment 80 act as Helmholtz resonators in the manner described above with regard to the single actuator distributed coolingapparatus 60. - One
common implementation 120 of a multiple actuator distributed coolingapparatus 80 is depicted inFIGS. 11A and 11B . Of course, many other implementations are possible for theapparatus 80, depending on the thermal management requirements of a system and the configuration of theapparatus 80. Thisexemplary implementation 120 is not limiting on the range of implementations for theapparatus 80. An exemplary implementation is presented merely to better illustrate the features of thepresent embodiment 80. - The
exemplary implementation 120 involves the use of an extrudedheat sink 121 for transporting heat away from aheated object 122. The multiple actuator distributed coolingapparatus 80 is positioned such that each of thetubes 81 in theapparatus 80 are aligned with a series ofchannels 123 formed with a series offins 124 of theheat sink 121 such that theflow 125 of the jet passes through thechannels 123 between thefins 124. Thisjet flow 125, in turn entrains secondarycool airflow 126 that is forced into thechannels 123 of theheat sink 121. - In another
utilization 132 of thiscooling module 80 the synthetic jet array oftubes 81 is used to reduce aflow bypass 130 in aheat sink 121 cooled by a fan-drivenflow 127.FIG. 12A depicts the situation without asynthetic jet actuator 80. In this embodiment, thefan 128 drawsfluid flow 127 though thechannels 123 between thefins 124 of aheat sink 121. However, due to the pressure drop generated by thechannels 123 of the heat sink 121 a large portion of theairflow 130 bypasses theheat sink 121. This is a common problem encountered in several applications like blade servers, telecom racks and the like, where the spacing between the component boards is narrow and there are large banks of fans attempting to drive massive airflow through the heat sink mounted on the hot components. - In this implementation, as depicted in
FIG. 12B , a synthetic jet actuator is positioned such that thetubes 81 of theactuator 80 are directed to empty theirflow 115 into thechannels 123 of theheat sink 121. Note that because of the distributed nature of theapparatus 80, the actuator can be positioned below the plane of theheat sink 121, thereby preventing any interference with the flow. When theactuator 80 is caused to operate, a tangentialsynthetic jet 115 is directed near the left edge of theheat sink 121. Thefan 128 continues to operate. The low-pressure, high momentum synthetic jet enables asignificant entrainment 131 of theairflow 130 that was previously bypassing theheat sink 121. - It should be emphasized that the above-described embodiments of the present invention, particularly, any “preferred” embodiments, are merely possible examples of implementations, merely set forth for a clear understanding of the principles of the invention. Many variations and modifications may be made to the above-described embodiment(s) of the invention without departing substantially from the spirit and principles of the invention. All such modifications and variations are intended to be included herein within the scope of this disclosure and the present invention and protected by the following claims.
Claims (40)
1. A device for thermal management comprising:
a housing defining an internal chamber and having an orifice in a wall of said housing; and
a volume changing device adjacent to said housing, said volume changing device for modifying a volume of said internal chamber;
wherein, when said volume changing device decreases the volume of said internal chamber, fluid within the internal chamber is expelled from the internal chamber through said orifice into an ambient fluid outside the housing;
wherein, when said volume changing device increases the volume of said internal chamber, ambient fluid outside the housing is drawn through said orifice into the internal chamber; and
wherein the fluid being expelled from the internal chamber and the ambient fluid being drawn into the internal chamber provide a cooling effect.
2. The device of claim 1 , further comprising a control system for controlling an operation of said volume changing device, wherein said operation of said volume changing device draws a gas from outside the housing into said internal chamber and forces a gas out of said internal chamber.
3. The device of claim 1 , wherein said volume changing device comprises a flexible diaphragm forming a portion of said housing.
4. The device of claim 3 , wherein said volume changing device further comprises a piezoelectric actuator adhered to said flexible diaphragm.
5. The device of claim 4 , wherein said flexible diaphragm comprises an elastomer material.
6. The device of claim 4 , wherein said flexible diaphragm comprises a polymer material.
7. The device of claim 1 , further comprising a tube connected to an external surface of said wall of said housing, said tube enclosing at least a portion of said orifice;
wherein said tube comprises an attachment end and an open end, said attachment end connected to said housing, and wherein an operation of said volume changing device generates a synthetic jet stream at said open end of said tube.
8. The device of claim 7 , wherein said tube generates said synthetic jet stream at a location remote from said housing.
9. The device of claim 7 , wherein said tube is sized such that a Helmholtz-type resonance is created in an interior of said tube due to the operation of said volume changing device.
10. The device of claim 7 , further comprising a heat sink having fins, wherein said open end of said tube is positioned adjacent to said heat sink such that said synthetic jet stream passes between adjacent ones of the fins.
11. The device of claim 10 , further comprising a fan, said fan positioned at one end of said heat sink such that said synthetic jet stream assists said fan by reducing a flow bypass due to a pressure drop of the fins.
12. The device of claim 1 , wherein said internal chamber comprises:
a first sub-chamber;
a second sub-chamber adjacent to said first sub-chamber; and
a third sub-chamber adjacent to said second sub-chamber.
13. The device of claim 12 , wherein said first sub-chamber and said second sub-chamber are formed from a first common wall, said first common wall contained within said internal chamber of said housing, and said first common wall comprising a first flexible diaphragm.
14. The device of claim 13 , wherein said second sub-chamber and said third sub-chamber are formed from a second common wall, said second common wall contained within said internal chamber of said housing, and said second common wall comprising a second flexible diaphragm.
15. The device of claim 14 , wherein said orifice further comprises at least one opening in each of said sub-chambers.
16. The device of claim 15 , further comprising a pipe adjacent to each said at least one opening, said each pipe enclosing at least a portion of said each opening.
17. The device of claim 16 , further comprising:
a first piezoelectric element attached to said first flexible diaphragm; and
a second piezoelectric element attached to said second flexible diaphragm.
18. The device of claim 17 , wherein said first and second flexible diaphragms comprise an elastomer material.
19. The device of claim 17 , wherein said first and second flexible diaphragms comprise a polymer material.
20. A device for cooling comprising:
a synthetic jet actuator; and
a channel having a proximal end and a distal end, said proximal end adjacent to said synthetic jet actuator;
wherein said synthetic jet actuator causes a first synthetic jet stream of fluid to flow substantially in a first direction through said channel;
wherein said synthetic jet actuator causes a second synthetic jet stream of fluid to flow substantially in a second direction through said channel, the second direction being opposite of the first direction; and
wherein the first and second synthetic jet streams provide a cooling effect.
21. The device of claim 20 , wherein said first synthetic jet stream forms at said distal end of said channel.
22. The device of claim 20 , wherein said second synthetic jet stream forms at said proximal end of said channel.
23. The device of claim 20 , further comprising a control system for controlling an operation of said synthetic jet actuator.
24. The device of claim 20 , wherein said synthetic jet actuator comprises:
a housing defining an internal chamber and having an orifice in a wall of said housing;
a volume changing means adjacent to said housing.
25. The device of claim 24 , wherein said volume changing means comprises a flexible diaphragm forming a portion of said housing.
26. The device of claim 25 , wherein said volume changing means further comprises a piezoelectric actuator adhered to said flexible diaphragm.
27. The device of claim 26 , wherein said flexible diaphragm comprises an elastomer material.
28. The device of claim 26 , wherein said flexible diaphragm comprises a polymer material.
29. The device of claim 26 , wherein said channel is sized such that a Helmholtz-type resonance is created in an interior of said channel due to the operation of said volume changing means.
30. The device of claim 29 , wherein said channel comprises a tube.
31. The device of claim 29 , further comprising a heat sink having fins, wherein said distal end of said channel is positioned adjacent to said heat sink such that said first synthetic jet stream passes between adjacent ones of said fins.
32. The device of claim 31 , further comprising a fan, said fan positioned at one end of said heat sink such that said first synthetic jet stream assists said fan by reducing flow bypass due to pressure drop of said fins.
33. The device of claim 20 , wherein said channel comprises a portion of a heat sink.
34. The device of claim 20 , wherein said synthetic jet actuator comprises a first synthetic jet actuator, said device further comprising:
a second synthetic jet actuator adjacent to said first synthetic jet actuator and;
a third synthetic jet actuator adjacent to said second synthetic jet actuator.
35. The device of claim 34 , wherein said synthetic jet actuators are formed by a common housing, and further wherein said first synthetic jet actuator and said second synthetic jet actuator are formed from a first common wall, and said second synthetic jet actuator and said third synthetic jet actuator are formed from a second common wall.
36. The device of claim 35 , wherein said channel comprises a first tube, said device further comprising:
a second tube having a proximal end and a distal end, said proximal end adjacent to said second synthetic jet actuator; and
a third tube having a proximal end and a distal end, said proximal end adjacent to said third synthetic jet actuator.
37. The device of claim 36 , wherein said first common wall comprises a first flexible diaphragm, and said second common wall comprises a second flexible diaphragm.
38. The device of claim 37 , further comprising:
a first piezoelectric element attached to said first flexible diaphragm; and
a second piezoelectric element attached to said second flexible diaphragm.
39. The device of claim 38 , wherein said first and second flexible diaphragms comprise an elastomer material.
40. The device of claim 38 , wherein said first and second flexible diaphragms comprise a polymer material.
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US11/325,239 US20060196638A1 (en) | 2004-07-07 | 2006-01-04 | System and method for thermal management using distributed synthetic jet actuators |
US11/406,924 US20060185822A1 (en) | 2004-07-07 | 2006-04-18 | System and method for thermal management using distributed synthetic jet actuators |
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US11/325,239 US20060196638A1 (en) | 2004-07-07 | 2006-01-04 | System and method for thermal management using distributed synthetic jet actuators |
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