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Research Papers: Elastohydrodynamic Lubrication

Combined Effects of Shear Thinning and Viscous Heating on EHL Characteristics of Rolling/Sliding Line Contacts

[+] 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), 041505 (Aug 06, 2008) (13 pages) doi:10.1115/1.2959111 History: Received January 22, 2008; Revised May 09, 2008; Published August 06, 2008

The combined influence of shear thinning and viscous heating on the behavior of film thickness and friction in elastohydrodynamic lubrication (EHL) rolling/sliding line contacts is investigated numerically. The constitutive equation put forward by Carreau is incorporated into the model to describe shear thinning. An extensive set of numerical simulations is presented. Comparison of the film thickness predictions with published experiments reveals good agreement, and it is shown that thermal effect plays an important role in the precise estimation of EHL film thickness and friction coefficient. Parametric simulations show that thermal effect in shear-thinning fluids is strongly affected by the power-law index used in the Carreau equation. Comparisons of prediction of the Newtonian fluid model are presented to quantify the degree to which it overestimates the film thickness.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Comparison of film thickness for two grid sizes and validation with Dowson–Higginson film thickness formula

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Figure 2

Comparison of friction coefficient versus slide/roll ratio curves from present model with those by Lee and Hsu (11) at W=1.3×10−4

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Figure 3

Pressure distributions at W=5×10−5 and 14×10−5 in isothermal and thermal EHLs at, S=1.0, U=10×10−11, and n=0.5

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Figure 4

Mean fluid temperature distributions at W=5×10−5, 8.5×10−5, and 14×10−5 for U=10×10−11, S=1.0, and n=0.5

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Figure 5

Mean fluid temperature distributions at U=5×10−11 and 10×10−11 for W=2×10−5, S=1, n=0.5, 0.7, and 1

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Figure 6

Mean fluid temperature distributions at S=0.5 and 1.0 for W=2×10−5, U=10×10−11 and n=0.5 and 0.7

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Figure 7

(a) Comparison of Carreau fluid film thickness with experimental values for 1000 cS oil at W=2.58×10−5. (b) Comparison of Carreau fluid film thickness with experimental values for 12500 cS oil at W=2.58×10−5

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Figure 8

Variation of minimum film thickness with speed in isothermal and thermal EHL at W=2×10−5, S=1.0, n=0.5, 0.7, and 1

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Figure 9

Variation of minimum film thickness with slide-to-roll ratio in isothermal and thermal EHL at W=2×10−5 and 14×10−5 for U=10×10−11, n=0.5

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Figure 10

Variation of coefficient of friction with slide-to-roll ratio in isothermal and thermal EHL at U=1×10−11 and 10×10−11 for W=14×10−5, n=0.5

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Figure 11

Variation of coefficient of friction with load in isothermal and thermal EHLs at n=0.5 and U=10×10−11

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