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Thin-plate orifices
Experiments carried out by RG Cunningham (1951)[1][2] demonstrated that the assumption that choked flow could occur for gases flowing through thin, square-edged orifice plates is not correct. The flow continued to increase as the downstream pressure was reduced to as low as 0.2 of the upstream pressure.[3]
Cunningham’s work included tests using air and steam with the results and conclusions presented as tables, charts and formulas. Limited information was provided for the tests with steam.[3]
Critical flow can, however, be expected for thick orifice plates (i.e. plates with a thickness of at least 6 times the orifice hole diameter.[3]
- ↑ R.G. Cunningham (1951). "Orifice Meters With Supercritical Flow". Trans. ASME 73: 625-630.
- ↑ Richard W. Miller (1996). Flow Measurement Engineering Handbook, Third Edition. McGraw Hill. ISBN 0-07-042366-0.
- ↑ 3.0 3.1 3.2 Flow through Orifice Plates in Compressible Fluid Service at High Pressure Drop