A Higher Order Perturbational Approach in the Lubricated EHL Contacts With Non-Newtonian Lubricant

[+] Author and Article Information
Jianming Wang

Illinois Institute of Technology, Chicago, IL 60616

He Hao Zhang

Shanghai University of Technology, Shanghai 200072, People’s Republic of China

J. Tribol 114(1), 95-99 (Jan 01, 1992) (5 pages) doi:10.1115/1.2920874 History: Received March 26, 1991; Revised July 01, 1991; Online June 05, 2008


In previous papers [7–9], investigations have been made on the influence of several kinds of non-Newtonian lubricants on the line contact EHL by using a first-order perturbational method. The practical engineering applications have been also tried successfully through papers [10–14]. However, when the slide/roll ratio reduces to zero the derived Reynolds equations become either the exact equations for a Newtonian lubricant or totally invalid. This, of course, is not the case for a natural non-Newtonian fluid. The facts show the limitation of the first-order method and also implies that with a tendency of decreased slide/roll ratio the first-order perturbational approach may bring a larger error and cannot describe accurately the behavior of non-Newtonian lubricants in the lubricated region. To improve it, a higher-order perturbational procedure is proposed in this paper.

Copyright © 1992 by The American Society of Mechanical Engineers
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