Measuring and testing – Volume or rate of flow – Thermal type
Patent
1989-08-21
1991-02-19
Goldstein, Herbert
Measuring and testing
Volume or rate of flow
Thermal type
731182, 73198, G01F 168
Patent
active
049932616
ABSTRACT:
A fluid flowmeter includes a sensor mounted on or in the inner surface of a conduit for measuring fluid flow through the conduit where the sensitivity of the sensor is dependent upon the thickness of the fluid boundary layer extending over the sensor. According to the invention, fluid is drawn out of the conduit through an aperture located a predetermined distance upstream of the sensor to remove the boundary layer developed upstream of the sensor thereby rendering the sensor immune to fluctuations in the thickness of the removed boundary layer. At the same time, a fresh boundary layer of reduced thickness and greater stability is initiated over the sensor so as to improve the sensitivity and repeatability of the sensor.
REFERENCES:
patent: 4785662 (1988-11-01), Ohta
General Motors Corporation
Goldstein Herbert
Jaeger Tim G.
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