Measuring and testing – Volume or rate of flow – With indirect temperature or density compensation
Patent
1988-04-08
1990-01-30
Ruehl, Charles A.
Measuring and testing
Volume or rate of flow
With indirect temperature or density compensation
73 29, 7386118, 7386127, G01F 186, G01F 1504
Patent
active
048965405
ABSTRACT:
The flowmeter is based on a measurement of phase difference between two points on the circumference of a pipe separated axially by an integral multiple of sound wavelength. Plane sound waves are generated aeroacoustically by a non-protruding ring cavity energized either directly by the flow or by a subsidiary flow of the same medium. The frequency of the aeroacoustic source varies with temperature and therefore the temperature can be obtained. In the case of steam flow, temperature can be measured independently and therefore from the measured frequency (or speed of sound), the quality of wet steam can be measured. The flowmeter is linear in velocity and no calibrations are required.
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Parthasarathy et al., Sound Generation by Flow Over Relatively Deep Cylindrical Cavities, J. Aco. Soc. An 78(5), Nov. 85, 1785-1795.
Shakkottai et al.; High Intensity Tone Generation by Aeroacoustic Sources, J. Acos. Soc. An. 82(6), Dec. 87, 2075-2085.
Migliorini et al., Linear Differential Pressure Flow Metering with Genuine 100:1 Turndown Capability, ISA 1987, 87-1266.
Kwack Eug Y.
Shakkottai Parthasarathy
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