Roughness-Induced Shear- and Squeeze-Film Effects in Magnetic Recording—Part I: Analysis

[+] Author and Article Information
Bharat Bhushan, Kristian To̸nder

Norwegian Institute of Technology, University of Trondheim, Trondheim, Norway

J. Tribol 111(2), 220-227 (Apr 01, 1989) (8 pages) doi:10.1115/1.3261892 History: Received February 22, 1988; Online October 29, 2009


General analyses are developed to predict the role of surface roughness, rarefaction effects, and various operating parameters in thin-film gas lubrication. Both shear- and squeeze-film effects are considered. The squeeze-film analysis is developed for transient and periodic motions. The analyses are based on average flow (roughness) factors. The results are presented in terms of Knudsen number, h/σ (film thickness/standard deviations of composite roughness) and roughness-orientation parameters. The appropriate analyses presented in this paper are simple and can be applied to magnetic recording and other applications to provide design guidelines.

Copyright © 1989 by ASME
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