Application of Average Flow Model to Lubrication Between Rough Sliding Surfaces

[+] Author and Article Information
Nadir Patir

GARD, Inc., Niles, Ill. 60648

H. S. Cheng

Department of Mechanical Engineering and Astronautical Sciences, Northwestern University, Evanston, Ill. 60201

J. of Lubrication Tech 101(2), 220-229 (Apr 01, 1979) (10 pages) doi:10.1115/1.3453329 History: Received July 06, 1978; Online October 20, 2010


The Average Flow Model introduced in an earlier paper is extended to include sliding contacts by deriving the shear flow factor for various roughness configurations. Similar to the pressure flow factors, the shear flow factor is obtained through numerical flow simulation on a model bearing having numerically generated roughness. The flow factors for isotropic and directional surfaces are expressed as empirical relationships in terms of h/σ, a surface pattern parameter γ defined as the ratio of x and y correlation lengths, and the variance ratio Vr1 which is the ratio of variance of surface 1 to that of the composite roughness. Expressions for the mean shear stress and horizontal force components due to local pressure in rough bearings are derived through the definition of shear stress factors, also obtained through simulation. The application of the average Reynolds equation to analyze roughness effects in bearings is demonstrated on a finite slider. The effects of the operating parameters as well as the roughness parameters on mean hydrodynamic load, mean viscous friction and mean bearing inflow are illustrated.

Copyright © 1979 by ASME
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