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Research Papers: Elastohydrodynamic Lubrication

EHL Circular Contact Film Thickness Correction Factor for Shear-Thinning Fluids

[+] Author and Article Information
Punit Kumar

Department of Mechanical Engineering, Louisiana State University, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803

M. M. Khonsari1

Department of Mechanical Engineering, Louisiana State University, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803khonsari@me.lsu.edu

1

Corresponding author.

J. Tribol 130(4), 041506 (Aug 07, 2008) (7 pages) doi:10.1115/1.2959115 History: Received March 17, 2008; Revised May 20, 2008; Published August 07, 2008

An extensive set of full elastohydrodynamic lubrication point contact simulations has been used to develop correction factors to account for the effect of shear-thinning lubricant behavior on the central and minimum film thickness in circular contacts under pure rolling condition. The film thickness for a shear-thinning lubricant can be easily obtained by dividing the corresponding Newtonian film thickness by the appropriate correction factor. Comparisons of the film thickness values obtained using the correction factors have been matched with the published experimental results pertaining to shear-thinning lubricants with a variety of realistic flow and piezoviscous properties under a wide range of operating speed. The good agreement between them establishes the validity and versatility of the correction factors developed in this paper.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Contact geometry and reference frame

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Figure 2

Comparison of the corrected and simulated central and minimum film thickness values with experiments (5) at PH=0.529GPa with μo=1.42Pas.

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Figure 3

Comparison of the corrected and simulated central film thickness values with experiments (4) at PH=0.5GPa with μo=0.49Pas.

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Figure 4

Comparison of the corrected and simulated central and minimum film thickness values with experiments (5) at PH=0.529GPa with μo=0.731Pas.

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