Surface Roughness Effects in Hydrodynamic Lubrication Involving the Mixture of Two Fluids

[+] Author and Article Information
Wang-Long Li

Department of Mechanical Engineering, National Kaohsiung Institute of Technology, 415 Chang Kung Road, 80782 Kaohsinug, Taiwan

J. Tribol 120(4), 772-780 (Oct 01, 1998) (9 pages) doi:10.1115/1.2833778 History: Received June 18, 1997; Revised February 24, 1998; Online January 24, 2008


In this paper, the relations expressing the effects of surface roughness and homogeneous mixture (the mixture of power-law fluid inserted into a Newtonian fluid) on the roughness-induced flow factors are derived. A coordinate transformation is utilized to simplify the derivation. By using the perturbation approach incorporated with Green function technique, the flow factors and shear stress factors are derived and expressed as functions of the volume fraction of the power-law fluid in the mixture (υ p ), the viscosity ratio of the power-law fluid to that of the Newtonian fluid (N or μp *), the flow behavior index of the power-law fluid (η), the Peklenik numbers (γi ) and the standard deviations (σl ) of each surface. A form of the average Reynolds equation is then obtained. It is shown that a number of currently available models are special cases of the theory presented here. Finally, the performance of a journal bearing is discussed.

Copyright © 1998 by The American Society of Mechanical Engineers
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