Autor:	Dye, D. E.
Zdroj:	Journal of Fluids Engineering; December 1965, Vol. 87 Issue: 4 p1025-1027, 3p
Abstrakt:	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.
Databáze:	Supplemental Index
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