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RESEARCH PAPERS

A Parametric Analysis of the Thermal Shear Localization in Elastohydrodynamic Lubrication Films

[+] Author and Article Information
L. Chang

Department of Mechanical and Nuclear Engineering,  The Pennsylvania State University, University Park, PA 16802

J. Tribol 128(1), 79-84 (Aug 30, 2005) (6 pages) doi:10.1115/1.2125968 History: Received March 24, 2005; Revised August 30, 2005

Experiments and computer simulations have revealed some unusual results of elastohydrodynamic lubrication (EHL) associated with a high degree of thermally induced inhomogeneous shear across the lubricant film, or thermal shear localization. The results include the development of a sizable film dimple in the central EHL region and a dramatic reduction in EHL traction. In this study, a theoretical analysis is carried out to determine the conditions under which the thermal shear localization may develop in EHL films. For a Newtonian lubricant obeying the Barus law of viscosity, a dimensionless group-parameter is identified that fully governs the degree of the thermal inhomogeneous shear. Results are presented that show the critical range of values of this parameter corresponding to the onset of the shear localization. The analysis is also extended to lubricants with non-Newtonian behavior. Results suggest that the same dimensionless group-parameter may be used to measure the degree of the shear localization when the lubricant viscosity in the parameter is replaced by an effective viscosity that accounts for the non-Newtonian effect.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Thermal shear localization in an EHL film with γ̇̂ave=40

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Figure 2

Degree of the thermal inhomogeneous shear as a function of the dimensionless parameter

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Figure 3

Thermal inhomogeneous shear and shear localization with Newtonian lubricants. (a) Roelands viscosity with αp=20, (b) Roelands viscosity with αp=40, and (c) Barus viscosity.

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Figure 4

Thermal inhomogeneous shear and shear localization with lubricants obeying Eyring rheology and Barus viscosity. (a) αp=20 and (b) αp=40.

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Figure 5

Thermal inhomogeneous shear and shear localization with lubricants obeying Eyring rheology and Roelands viscosity. (a) αp=20 and (b) αp=40.

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Figure 6

Thermal inhomogeneous shear and shear localization with lubricants obeying Bair-Winer rheology and Barus viscosity. (a) αp=20 and (b) αp=40.

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