The Inception of Cavitation on Isolated Surface Irregularities

[+] Author and Article Information
J. W. Holl

Ordnance Research Laboratory, The Pennsylvania State University, University Park, Pa.

J. Basic Eng 82(1), 169-183 (Mar 01, 1960) (15 pages) doi:10.1115/1.3662508 History: Received December 18, 1958; Online November 04, 2011


The inception of cavitation on isolated surface irregularities imbedded in a turbulent boundary layer is investigated experimentally and theoretically. Two families of cylindrical roughness elements having constant cross sections are studied. One family has a circular-arc cross section. The other family has a triangular cross section and was selected to simulate the separating flow which is typical of an actual surface irregularity. The theoretical minimum-pressure coefficient for the circular-arc irregularities is determined as a function of the relative height of roughness for several values of the boundary-layer shape parameter. Cavitation tests in the water tunnels of the Ordnance Research Laboratory on roughness elements ranging from 0.002 to 0.5 in. in height indicate that the incipient-cavitation number of an isolated surface irregularity is dependent upon the relative height of roughness, the boundary-layer shape parameter, the velocity, and other variables as yet unknown.

Copyright © 1960 by ASME
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