Measuring and testing – Volume or rate of flow – By measuring vibrations or acoustic energy
Patent
1987-03-30
1989-02-28
Tokar, Michael J.
Measuring and testing
Volume or rate of flow
By measuring vibrations or acoustic energy
G01F 132
Patent
active
048074810
ABSTRACT:
This invention discloses a three-in-one flowmeter that measures volume flow rate, mass flow rate and the density of the fluid, which flowmeter comprises a vortex generator of an elongated shape having a blunt upstream side disposed across a first cross section of the flow passage, a vortex sensor having the shape of a wing disposed across a second cross section of the flow passage and a transducer converting the alternating lift forces exerted on the vortex sensor by the vortices generated by the vortex generator to an alternating electric signal, wherein the wing sensor is connected to a force receiving member extending from the transducer by a mechanical coupling. The volume flow rate is determined from the frequency of the signals as the fluid velocity is proportional to the frequency at which the vortices are generated by the vortex generator. The mass flow rate is determined by combining the frequency and the amplitude of the signals as the frequency is proportional to the fluid velocity and the amplitude is proportional to the dynamic pressure that is equal to one half of the fluid density times the square of the fluid velocity. The fluid density is obtained as the ratio of the mass flow rate divided by the volume flow rate. The combination of the wing sensor and the transducer includes self-calibrating means for accurately measuring the amplitude of the lift forces generated by the vortices independent of the drift in the characteristics of the transducer.
REFERENCES:
patent: 3756078 (1973-09-01), Yamasaki et al.
patent: 4048854 (1977-09-01), Herzl
patent: 4094194 (1978-06-01), Herzl
patent: 4727756 (1988-03-01), Lew
"Streak Lines in the Wake Behind a Circular Cylinder", (Photo. by Homann, 1936): copied from an Introduct. to Fluid Dynamics by G. K. Batchelor.
Product brochure from Fisher-Porter on "V3 Vortex Shedd. Flowmeter", Fisher-Porter Pub. No. 23640.
Product brochure from Fisher-Porter on "LV-2 Vortex Shedd. Flowmeter", Fisher-Porter Pub. No. 22834.
Bell Robert P.
Tokar Michael J.
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