Performance of a Small-Sized, Critical Flowmeter Assembly

[+] Author and Article Information
D. E. Dye

Dayton, Ohio

J. Basic Eng 87(4), 1025-1027 (Dec 01, 1965) (3 pages) doi:10.1115/1.3650794 History: Received March 24, 1964; Online November 03, 2011


Measurement of low mass-flow rates was readily accomplished by development of two similar flowmetering assemblies. Each assembly consisted of five 0.016 to 0.070-in. diameter critical-flow nozzles and individual control valves connected between common inlet and exit manifolds. Mass-flow rates through each nozzle were determined over a range of upstream pressure and temperature. The probable deviations in the measured data are approximately ≠0.83 percent. Discharge coefficients were calculated from the calibration results using the well-known one-dimensional critical-flow equation. An average error of ≠2.5 percent in the discharge coefficient is possible because of the difficulty in determining true throat areas of these small-sized nozzles.

Copyright © 1965 by ASME
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