Velocity Coefficients For Free Jets From Sharp-Edged Orifices

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

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

J. Fluids Eng 106(1), 13-17 (Mar 01, 1984) (5 pages) doi:10.1115/1.3242391 History: Received August 02, 1983; Online October 26, 2009


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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