Theoretical Approach to Turbulent Lubrication Problems Including Surface Roughness Effects

[+] Author and Article Information
H. Hashimoto

Department of Mechanical & Production Engineering, Tokai University, Kanagawa, 259-12, Japan

S. Wada

Department of Mechanical Engineering, School of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 160, Japan

J. Tribol 111(1), 17-22 (Jan 01, 1989) (6 pages) doi:10.1115/1.3261870 History: Received July 12, 1988; Online October 29, 2009


A new theoretical approach to turbulent lubrication problems including the surface roughness effects is described. On the basis of a logarithmic velocity distribution law in the turbulent boundary layers, the resistance laws for pressure and shear flows in the lubricant film are formulated separately in both cases of smooth and homogeneous rough surfaces. Moreover, combining the bulk flow concept proposed by Hirs with the formulated resistance laws, the generalized turbulent lubrication equation including the surface roughness effects is derived. Some numerical results for the modified turbulence coefficients are presented in the graphic form for different values of relative roughness, and the effects of surface roughness on the turbulent lubrication characteristics are generally discussed.

Copyright © 1989 by ASME
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