Two Reference Time Scales for Studying the Dynamic Cavitation of Liquid Films

[+] Author and Article Information
D. C. Sun

Department of Mechanical and Industrial Engineering, Thomas J. Watson School of Engineering and Applied Science, State University of New York at Binghamton, Binghamton, NY 13902-6000

D. E. Brewe

U.S. Army Aviation Research and Technology Activity—AVSCOM, Lewis Research Center, Cleveland, Ohio 44135

J. Tribol 114(3), 612-615 (Jul 01, 1992) (4 pages) doi:10.1115/1.2920925 History: Received June 13, 1991; Revised November 01, 1991; Online June 05, 2008


Two formulas, one for the characteristic time of filling a void with the vapor of the surrounding liquid, and one of filling the void by diffusion of the dissolved gas in the liquid, are derived. By comparing these time scales with that of the dynamic operation of oil film bearings, it is concluded that the evaporation process is usually fast enough to fill the cavitation bubble with oil vapor; whereas the diffusion process is much too slow for the dissolved air to liberate itself and enter the cavitation bubble. These results imply that the formation of a two phase fluid in dynamically loaded bearings, as often reported in the literature, is caused by air entrainment. They further indicate a way to simplify the treatment of the dynamic problem of bubble evolution.

Copyright © 1992 by The American Society of Mechanical Engineers
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