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RESEARCH PAPERS

Effect of Slip Flow in Narrow Porous Bearings With Arbitrary Wall Thickness

[+] Author and Article Information
P. R. K. Murti

MEMA, Université Catholique de Louvain, Louvain-la-Neuve, Belgium

J. Appl. Mech 42(2), 305-310 (Jun 01, 1975) (6 pages) doi:10.1115/1.3423572 History: Received May 01, 1973; Revised August 01, 1974; Online July 12, 2010

Abstract

The experimental work of Beavers, et al., established that velocity slip takes place over a permeable boundary. The Reynolds equation governing the flow of lubricant in a finite porous bearing is appropriately modified to include the effect of velocity slip at the permeable boundary. The performance of a bearing with arbitrary wall thickness is then analyzed adopting the narrow bearing approximation. An exact solution is given for the pressure of the lubricant in the bearing material using modified Bessel functions and the modified Reynolds equation for the problem is solved by the Galerkin method. Numerical results obtained with a digital computer indicate that slip flow adversely affects the load capacity and reduces the friction force on the journal; the attitude angle, however, is not significantly affected. Also, the analysis indicates that the effects of velocity slip are prominent when the bearing operates at a higher eccentricity ratio and/or the bearing matrix has a low permeability. The results are presented in graphical and tabular forms and guidelines are outlined to enable designers in assessing bearing performance using the results.

Copyright © 1975 by ASME
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