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RESEARCH PAPERS

Theoretical Investigation in Thermoelastohydrodynamic Lubrication With Non-Newtonian Lubricants Under Sudden Load Change

[+] Author and Article Information
M. Mongkolwongrojn

Electro-Mechanical Engineering Laboratory, Mechanical Engineering Department, ReCCIT, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailandkmmongko@kmitl.ac.th

C. Aiumpornsin, K. Thammakosol

Electro-Mechanical Engineering Laboratory, Mechanical Engineering Department, ReCCIT, Faculty of Engineering, King Mongkut’s Institute of Technology Ladkrabang, Bangkok 10520, Thailand

J. Tribol 128(4), 771-777 (Jul 18, 2006) (7 pages) doi:10.1115/1.2345393 History: Received February 24, 2004; Revised July 18, 2006

The time-dependent thermal compressible elastohydrodynamic lubrication of a sliding line contact has been developed to investigate the effect of a sudden load change. The time-dependent modified Reynolds equation with non-Newtonian fluids has been formulated using a power law model. Properties of non-Newtonian dilatant fluids for solid-liquid lubricants have been studied experimentally using two common solid particles; namely, molybdenum disulfide and polytetrafluoroethylene. The simultaneous systems of modified Reynolds, elasticity, and energy equations with initial conditions were solved numerically using a multigrid multilevel technique. The performance characteristics of the thermoelastohydrodynamic line contact were presented with varying dimensionless time for the pressure distribution, temperature distribution, and oil film thickness. The transient response of the line contact between two infinitely long cylindrical surfaces was simulated under a heavy step load function. The coefficients of friction were also presented in this work at steady condition with varying particle concentration. This simulation showed a significant effect of solid particles on thermoelastohydrodynamic lubrication under heavy load conditions.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Initial pressure profile under dimensionless load W′=3×10−5 and dimensionless speed parameter U=1×10−11

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Figure 2

Transient pressure profile under dimensionless load change from 3×10−5 to 1.2×10−4 at time t=0.0846s

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Figure 3

Transient pressure profile under dimensionless load change from 3×10−5 to 1.2×10−4 at time t=0.2539s

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Figure 4

Pressure profile at steady-state under dimensionless load W′=1.2×10−4

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Figure 5

Initial film thickness under dimensionless load W′=3×10−5 and dimensionless speed parameter U=1×10−11

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Figure 6

Transient film thickness profile under dimensionless load change from 3×10−5 to 1.2×10−4 at time t=0.0846s

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Figure 7

Transient film thickness profile under dimensionless load change from 3×10−5 to 1.2×10−4 at time t=0.2539s

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Figure 8

Film thickness profile at steady-state under dimensionless load W′=1.2×10−4

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Figure 9

Initial temperature profile under dimensionless load W′=3×10−5 and dimensionless speed parameter U=1×10−11

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Figure 10

Transient temperature profile under dimensionless load change from 3×10−5 to 1.2×10−4 at time t=0.0846s

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Figure 11

Temperature profile at steady-state under dimensionless load W′=1.2×10−4

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Figure 12

Transient response of the film thickness at U=1×10−11 at x=0mm under dimensionless load change from 3×10−5 to 1.2×10−4

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Figure 13

Transient response of the temperature at U=1×10−11 under dimensionless load change from 3×10−5 to 1.2×10−4

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Figure 14

Effect of the particle concentration and loads on the coefficient of friction

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