Velocity Coefficients For Free Jets From Sharp-Edged Orifices

[+] Author and Article Information
J. H. Lienhard, V

Research Assistant,
Department of Chemical,
Nuclear, and Thermal Engineering,
University of California,
Los Angeles, Calif. 90024

J. H. Lienhard, (IV)

Professor of Mechanical Engineering,
University of Houston,
Houston, Texas 77004,
Fellow ASME

Contributed by the Fluids Engineering Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS and presented at the 7th Annual/Energy-Sources Technology Conference and Exhibition, New Orleans, La., Feb. 11–17, 1984. Manuscript received by the Fluids Engineering Division, August 2, 1983. Paper No. 84-FE-3.

J. Fluids Eng 106(1), 13-17 (Aug 25, 2017) (5 pages) doi:10.1115/1.3242391 History: Received August 02, 1983

The viscosity-dependence of the velocity coefficient for a free liquid jet, issuing from a sharp-edged orifice, is predicted by computing the dissipation of energy in the boundary layer on the back of the orifice plate. The prediction is upheld by the only known direct measurements of velocity coefficients. The resulting coefficients are much closer to unity for large orifices than they are generally assumed to be. The influence of surface tension on small jets is also explained.

Copyright © 1984 by ASME
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Grahic Jump Location
Fig. 1

Configuration and definition of terms

Grahic Jump Location
Fig. 2

Potential flows for boundary analyses

Grahic Jump Location
Fig. 3

Comparison of equation (19) with the data of Judd and King



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