WO1998014775A1 - Method of determining a characteristic of a fluid - Google Patents
Method of determining a characteristic of a fluid Download PDFInfo
- Publication number
- WO1998014775A1 WO1998014775A1 PCT/US1997/017887 US9717887W WO9814775A1 WO 1998014775 A1 WO1998014775 A1 WO 1998014775A1 US 9717887 W US9717887 W US 9717887W WO 9814775 A1 WO9814775 A1 WO 9814775A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- speed
- fluid
- calculating
- reynolds number
- flow rate
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/24—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave
- G01P5/245—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring the direct influence of the streaming fluid on the properties of a detecting acoustical wave by measuring transit time of acoustical waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/66—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by measuring frequency, phase shift or propagation time of electromagnetic or other waves, e.g. using ultrasonic flowmeters
- G01F1/667—Arrangements of transducers for ultrasonic flowmeters; Circuits for operating ultrasonic flowmeters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/02—Analysing fluids
- G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02818—Density, viscosity
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02836—Flow rate, liquid level
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/048—Transmission, i.e. analysed material between transmitter and receiver
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/056—Angular incidence, angular propagation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/102—Number of transducers one emitter, one receiver
Definitions
- the present invention relates generally to the field of flow meters and more specifically to a method of determining a characteristic of a fluid.
- Ultrasonic flow meters have many advantages over other methods of determining flow rates. Ultrasonic flow meters can continuously measure the flow rate, while other methods generally measure average flow rates. In addition, ultrasonic flow meters are obstructionless and work with non- conductive fluids.
- Ultrasonic flow meters have a pair of transducers that are placed on either side of the flow path of a fluid flowing through a pipe.
- the transducers are pointed at each other and the line between them has a component in the direction of the fluid flow.
- the principle used to detect flow rates is that the wavelength of an ultrasonic packet will lengthen in the upstream and shorten in the downstream path. The amount by which the wavelength changes is directly proportional to the flow rate.
- the flow rate across the pipe is not uniform. This means that what is really measured by the ultrasonic meter is the line integral fluid speed (measured flow speed). Multiplying the measured flow speed by the area of the pipe to find the volume flow speed gives erroneous results.
- a fudge factor or a heuristic relationship is used to adjust to the measured flow speed, before multiplying by the pipe area to determine the volume flow speed.
- a method that overcomes these and other problems involves measuring a sonic transit time, along a non-perpendicular path, through the fluid.
- the sonic transit time is used to determine a speed of sound in the fluid.
- a measured flow rate is determined from the sonic transit time.
- a friction factor is calculated using the speed of sound and the measured flow rate.
- a velocity profile is determined using the friction factor.
- an adjusted flow rate is calculated using the velocity profile.
- FIG. 1 is a block diagram of an ultrasonic flow meter
- FIG. 2 is a flow chart of a process for determining an adjusted flow rate
- FIG. 3 is a flow chart of a process of determining a flow volume
- FIG. 4 is a flow chart of a process for determining an average flow speed
- FIG. 5 is a flow chart of a process of determining a calculated fluid speed
- FIG. 6 is a flow chart of a process of determining a friction factor.
- FIG. 1 is a block diagram of an ultrasonic flow meter 10 attached to a pipe 12.
- a fluid is flowing in the pipe 12.
- the ultrasonic flow meter 10 has a pair of transducers 14, 16 that emit and receive ultrasonic pulses.
- the ultrasonic pulses travel along a path that is non-perpendicular (non- perpendicular path) to the direction of flow of the fluid.
- the pair of transducers 14, 16 send and receive signals from a decoding electronics 18.
- the decoding electronics determine an upstream sonic speed and a downstream sonic speed. These sonic speeds are used by a microprocessor 20 to determine a speed of sound in the fluid and a measured flow rate.
- the microprocessor controls the decoding electronics and calculates a temperature, a viscosity, a head loss, a density, a volume flow rate of the fluid.
- the microprocessor 20 is connected to a memory (computer-readable storage medium) 22.
- the memory 22 contains computer-readable instructions that can be executed by the microprocessor 20.
- the memory 12 can be a ROM (Read Only Memory), a RAM (Random Access Memory), a CD-ROM (Compact Disk-Read Only Memory), a diskette or any other computer readable storage medium.
- the microprocessor 20 is coupled to a display 24.
- the display 24 is used to display a characteristic (e.g., temperature, volume flow rate) of the fluid flowing in the pipe 12.
- a process, executable by a computer (microprocessor), to determine an adjusted flow rate is shown in FIG. 2.
- the process starts, step 100, by measuring a sonic transit time in both the upstream and the downstream paths at step 102.
- a speed of sound in the fluid is determined using the sonic transit times at step 104.
- a measured flow rate (line integral fluid speed) of the fluid is determined at step 106.
- a friction factor is calculated at step 108, using the speed of sound and the measured flow rate.
- the fraction factor allows us to determine a velocity profile of the fluid at step 110.
- a velocity profile shows the velocity of the fluid at any point along a radial line inside the pipe. Using this knowledge we can integrate the velocity per unit area to determine an adjusted flow rate.
- FIG. 3 is a flow chart of the process to determine the flow volume of a liquid.
- the process starts, step 150, by fetching a flow data count at step 152.
- the flow data count is the difference frequency between an upstream frequency and a downstream frequency.
- the upstream frequency is defined as the frequency at which one period of the upstream signal is equal to the upstream transit time between the transducers.
- the downstream frequency is similarly defined.
- the sound speed data count is fetched at step 154.
- the sound speed data count is the sum frequency between the upstream frequency and the downstream frequency.
- a sonic speed (speed of sound) is calculated using the sound speed data count at step 156.
- a standard look up table for every fluid relates the speed of sound in the fluid to a density, a viscosity and a temperature of the fluid.
- a measured flow speed is calculated using the flow data count at step 158.
- An average flow speed is iteratively calculated at step 160. The process of iteratively calculating the average flow speed is explained in more detail in FIG. 4. From the average flow speed, the flow volume is calculated at step 162, which ends the process at step 164.
- FIG. 4 is a flow chart of the iterative process of determining the average velocity (by volume) of the fluid in the pipe.
- the process starts, step 200, by setting an assumed average velocity equal to the measured flow speed (MFS, measured fluid speed) at step 202.
- a Reynolds number is calculated using the assumed average velocity, the density of the fluid and the viscosity of the fluid at step 204.
- the friction factor is iteratively calculated at step 206.
- a calculated fluid speed is determined at step 208.
- the process of determining the calculated fluid speed (CFS) is explained in more detail in conjunction with FIG. 5.
- the ratio of the calculated fluid speed to the measured fluid speed is compared to a predetermined range at step 210.
- FIG. 5 is a flow chart of the process of determining the calculated fluid speed. The process starts, step 250, by determining if the Reynolds number is less than or equal to 2000, at step 252. When the Reynolds number is less than or equal to 2000 using a Laminar flow velocity profile at step 254. The calculated fluid speed is determined at step 256. When the Reynolds number is greater than 2000, it is determined if the Reynolds number is greater than or equal to 4000 at step 258.
- step 300 by selecting an assumed friction factor at step 302.
- the initial assumed friction factor is set equal to 0.032.
- a determined friction factor (DFF) is calculated at step 304 using a pipe diameter.
- step 306 it is determined if the friction ratio between the predetermined friction factor and the assumed friction factor is less than a predetermined friction range. In one embodiment it is determined if the absolute value of one minus the friction ratio is less one part per million.
- the friction ratio is not between the predetermined friction factor, setting the assumed friction factor equal to the determined friction factor at step 308.
- setting the friction factor equal to the assumed friction factor at step 310, which ends the process at step 312. Knowing the friction factor the head loss through the flow meter can be calculated. This information is important for axial meters.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU48075/97A AU4807597A (en) | 1996-10-04 | 1997-10-01 | Method of determining a characteristic of a fluid |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/720,789 US5835884A (en) | 1996-10-04 | 1996-10-04 | Method of determining a characteristic of a fluid |
US08/720,789 | 1996-10-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998014775A1 true WO1998014775A1 (en) | 1998-04-09 |
Family
ID=24895294
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1997/017887 WO1998014775A1 (en) | 1996-10-04 | 1997-10-01 | Method of determining a characteristic of a fluid |
Country Status (3)
Country | Link |
---|---|
US (1) | US5835884A (en) |
AU (1) | AU4807597A (en) |
WO (1) | WO1998014775A1 (en) |
Cited By (3)
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DE19944047C2 (en) * | 1999-09-14 | 2003-09-25 | Schubert & Salzer Control Syst | Device for measuring concentration or density as well as particles |
EP1644833A2 (en) * | 2003-07-14 | 2006-04-12 | Daniel Industries, Inc., | Method to snapshot and playback raw data in an ultrasonic meter |
EP1798530A2 (en) | 2005-12-14 | 2007-06-20 | Thermo Fisher Scientific Inc. | Multi-path ultrasonic flow measurement of partially developed flow profiles |
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US6067861A (en) * | 1998-06-18 | 2000-05-30 | Battelle Memorial Institute | Method and apparatus for ultrasonic doppler velocimetry using speed of sound and reflection mode pulsed wideband doppler |
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- 1996-10-04 US US08/720,789 patent/US5835884A/en not_active Expired - Fee Related
-
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- 1997-10-01 WO PCT/US1997/017887 patent/WO1998014775A1/en active Application Filing
- 1997-10-01 AU AU48075/97A patent/AU4807597A/en not_active Abandoned
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USRE28929E (en) * | 1972-07-03 | 1976-08-17 | E. I. Du Pont De Nemours & Company | Ultrasonic fluid speed of sound and flow meter apparatus and method |
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US4754641A (en) * | 1987-02-10 | 1988-07-05 | Schlumberger Technology Corporation | Method and apparatus for measurement of fluid flow in a drilling rig return line |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19944047C2 (en) * | 1999-09-14 | 2003-09-25 | Schubert & Salzer Control Syst | Device for measuring concentration or density as well as particles |
EP1644833A2 (en) * | 2003-07-14 | 2006-04-12 | Daniel Industries, Inc., | Method to snapshot and playback raw data in an ultrasonic meter |
EP1644833A4 (en) * | 2003-07-14 | 2007-08-15 | Daniel Ind Inc | Method to snapshot and playback raw data in an ultrasonic meter |
EP1798530A2 (en) | 2005-12-14 | 2007-06-20 | Thermo Fisher Scientific Inc. | Multi-path ultrasonic flow measurement of partially developed flow profiles |
JP2007163478A (en) * | 2005-12-14 | 2007-06-28 | Thermo Fisher Scientific Inc | Multi-path ultrasonic flow measuring method and system for flow cross section progressed partially |
EP1798530A3 (en) * | 2005-12-14 | 2007-07-25 | Thermo Fisher Scientific Inc. | Multi-path ultrasonic flow measurement of partially developed flow profiles |
JP4668163B2 (en) * | 2005-12-14 | 2011-04-13 | サーモ フィッシャー サイエンティフィック インコーポレーテッド | Multipath ultrasonic flow measurement method and system for partially developed flow cross section |
Also Published As
Publication number | Publication date |
---|---|
US5835884A (en) | 1998-11-10 |
AU4807597A (en) | 1998-04-24 |
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