Inlet Shear Heating in Elastohydrodynamic Lubrication

[+] Author and Article Information
J. A. Greenwood

Engineering Department, University of Cambridge, Cambridge, England

J. J. Kauzlarich

Department of Mechanical Engineering, University of Virginia, Charlottesville, Va.

J. of Lubrication Tech 95(4), 417-423 (Oct 01, 1973) (7 pages) doi:10.1115/1.3451844 History: Received January 14, 1972; Revised May 17, 1972; Online October 18, 2010


In EHL, the oil film thickness of rollers is controlled by the rate at which the oil is drawn into the conjunction of the disks by the moving surfaces of the rollers. The theory often assumes isothermal conditions in the inlet although it can be shown that the maximum shear rate often exceeds 106 sec−1 , even in pure rolling. A theoretical analysis is presented for the oil temperature rise in the inlet of rollers, and the result is applied to predict the consequent film thickness. It is found that thermal effects on film thickness are only negligible at low rolling speeds. A comparison with experiment supports the conclusion that the thinning of the film thickness below that predicted by isothermal theory is substantially explained by inlet shear heating of the lubricant.

Copyright © 1973 by ASME
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