Correlations of Thermodynamic Effects for Developed Cavitation

[+] Author and Article Information
M. L. Billet, J. W. Holl, D. S. Weir

Applied Research Laboratory, The Pennsylvania State University, State College, Pa. 16801

J. Fluids Eng 103(4), 534-542 (Dec 01, 1981) (9 pages) doi:10.1115/1.3241762 History: Received August 18, 1979; Online October 26, 2009


The net positive suction head (NPSH) requirements for a pump are determined by the combined effects of cavitation, fluid properties, pump geometry, and pump operating point. An important part of this determination is the temperature depression (ΔT) defined as the difference between ambient liquid temperature and cavity temperature. Correlations are presented of the temperature depression for various degrees of developed cavitation on venturis and ogives. These correlations, based on a semiempirical entrainment theory, express ΔT in terms of the dimensionless numbers of Nusselt, Reynolds, Froude, Weber, and Péclét, and dimensionless cavity length (L/D). The ΔT data were obtained in Freon 114, hydrogen, and nitrogen for the venturis and in Freon 113 and water for the ogives.

Copyright © 1981 by ASME
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