Generalized Expansion Factor of an Orifice for Subsonic and Supercritical Flows

[+] Author and Article Information
R. P. Benedict

Steam Divisions, Westinghouse Electric Corp., Lester, Pa.

J. Basic Eng 93(2), 121-136 (Jun 01, 1971) (16 pages) doi:10.1115/1.3425195 History: Received July 29, 1970; Online October 27, 2010


General expressions are developed which approximate the expansion factor of any orifice in any installation for both subsonic and supercritical flows. These factors are based on a presumed knowledge of the incompressible contraction coefficient for the same orifice. Comparisons are made between the suggested approximations and: ASME empirical expansion factors; previous experimental studies; and new experimental work.

Copyright © 1971 by ASME
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