Effect of Rate of Viscosity Variation on the Performance of Journal Bearings

[+] Author and Article Information
D. Vijayaraghavan

Department of Mechanical Engineering, The University of Toledo, Toledo, OH

D. E. Brewe

US Army Vehicle Propulsion Directorate, NASA/Lewis Research Center, Cleveland, OH 44135

J. Tribol 120(1), 1-7 (Jan 01, 1998) (7 pages) doi:10.1115/1.2834181 History: Received March 01, 1995; Revised August 28, 1995; Online January 24, 2008


Variations in viscosity within the film is known to have a pronounced effect on journal bearing performance. Lubricants of the same grade with the same viscosity at a particular temperature and ambient pressure can have different viscosity values at other temperatures and pressures. The effect of rate of viscosity variation due to the changes in temperature and pressure on the performance of an axial grooved journal bearing is the focus of this investigation. Roelands’ model on viscosity-temperature-pressure relationship of lubricants is adopted. Cavitation modelling with regard to thermal effects and mass conservation are carefully considered. A total THD model with heat transfer within the fluid film and heat dissipation to the ambient through the journal and bush, is utilized. For different rates of viscosity variation with respect to temperature and pressure, comparison of performance parameters and typical temperature distributions are presented.

Copyright © 1998 by The American Society of Mechanical Engineers
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