Effect of Geometry on Hydrodynamic Film Thickness

[+] Author and Article Information
D. E. Brewe

AVRADCOM Research and Technology Laboratories, Cleveland, Ohio 44135

B. J. Hamrock

NASA Lewis Research Center, Cleveland, Ohio 44135

C. M. Taylor

University of Leeds, Leeds, England

J. of Lubrication Tech 101(2), 231-237 (Apr 01, 1979) (7 pages) doi:10.1115/1.3453332 History: Received March 10, 1978; Revised June 19, 1978; Online October 20, 2010


The influence of geometry on the isothermal hydrodynamic film separating two rigid solids was investigated. Pressure-viscosity effects were not considered. The minimum film thickness is derived for fully flooded conjunctions by using the Reynolds boundary conditions. It was found that the minimum film thickness had the same speed, viscosity, and load dependence as Kapitza’s classical solution. However, the incorporation of Reynolds boundary conditions resulted in an additional geometry effect. Solutions using the parabolic film approximation are compared with those using the exact expression for the film in the analysis. Contour plots are shown that indicate in detail the pressure developed between the solids.

Copyright © 1979 by ASME
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