User:Milton Beychok/Sandbox: Difference between revisions

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-==Thin-plate orifices==
-Experiments carried out by RG Cunningham (1951)<ref>{{cite journal|author=R.G. Cunningham|year=1951|month=|title=Orifice Meters With Supercritical Flow|journal=Trans. ASME |volume=73|issue= |pages=625-630|issn=}}</ref><ref>{{cite book|author=Richard W. Miller|title=Flow Measurement Engineering Handbook|edition=Third Edition|publisher=McGraw Hill|year=1996|isbn=0-07-042366-0}}</ref> 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.<ref name=DKB>[http://members.ozemail.com.au/~denniskb/calcs/TECH%20MEMO_Y%20Factor.pdf Flow through Orifice Plates in Compressible Fluid Service at High Pressure Drop]</ref>
-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.<ref name=DKB/>
-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.<ref name=DKB/>
-{{reflist}}

Revision as of 21:11, 5 January 2009