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RESEARCH PAPERS: Forced Convection

Heat Transfer in a Thin-Film Flow in the Presence of Squeeze and Shear Thinning: Application to Piston Rings

[+] Author and Article Information
D. J. Radakovic

U.S. Steel Research, 4000 Tech Center Drive, Monroeville, PA 15146

M. M. Khonsari

Department of Mechanical Engineering, University of Southern Illinois at Carbondale, Carbondale, IL 62901

J. Heat Transfer 119(2), 249-257 (May 01, 1997) (9 pages) doi:10.1115/1.2824217 History: Received March 01, 1996; Revised October 30, 1996; Online December 05, 2007

Abstract

The governing equations and appropriate numerical solutions are presented for the heat transfer and the flow of a shear thinning fluid confined between a curved and plane surface in a thin-film configuration. One surface undergoes a reciprocating motion and the fluid experiences transverse squeeze action, as in a typical piston ring of an internal combustion engine. The effect of viscosity variations with temperature, in conjunction with the non-Newtonian shear thinning behavior of multigrade oils, are included in the analysis. Extensive numerical simulations of the performance of the piston are presented and compared to the isothermal Newtonian solutions. Computations show that shear thinning can have a significant effect on parameters such as film thickness, viscous drag force, and power loss. The thermal effects from viscous dissipation in the clearance space along the piston ring also influence these parameters, but to a lesser degree.

Copyright © 1997 by The American Society of Mechanical Engineers
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