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Research Papers: Elastohydrodynamic Lubrication

New Central Film Thickness Equation for Shear Thinning Lubricants in Elastohydrodynamic Lubricated Rolling/Sliding Point Contact Conditions

[+] Author and Article Information
Puneet Katyal

Department of Mechanical Engineering,
National Institute of Technology Kurukshetra,
Haryana 136119, India
e-mail: katyalgju@gmail.com

Punit Kumar

Department of Mechanical Engineering,
National Institute of Technology Kurukshetra,
Haryana 136119, India
e-mail: punkum2002@yahoo.co.in

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received January 30, 2014; final manuscript received June 17, 2014; published online August 4, 2014. Assoc. Editor: Dong Zhu.

J. Tribol 136(4), 041504 (Aug 04, 2014) (9 pages) Paper No: TRIB-14-1029; doi: 10.1115/1.4028044 History: Received January 30, 2014; Revised June 17, 2014

This paper offers central film thickness formula pertaining to shear-thinning lubricants under rolling/sliding point contact conditions. The shear-thinning behavior of the lubricants is modeled using Carreau viscosity equation and the piezo-viscous response employed herein is the free-volume based Doolittle equation in conjunction with Tait's equation of state for lubricant compressibility. The present formulation is based on reciprocal asymptotic isoviscous piezo-viscous coefficient as it is a more accurate measure of the high pressure piezo-viscous response of elastohydrodynamic lubricated (EHL) lubricants compared to the conventional pressure–viscosity coefficient. Comparisons between simulated, curve-fitted values, and experimental results validate both the employed numerical approach and rheological model.

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References

Figures

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Fig. 3

Comparison of log hc/Rx versus log U characteristics obtained using Eq. (15) and full EHL simulations for a shear-thinning lubricant with Gcr = 5.0 kPa, n = 0.6, α* = 23.9 GPa−1

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Fig. 4

Comparison of log hc/Rx versus log α* characteristics obtained using Eq. (15) and full EHL simulations for a shear-thinning lubricant with Gcr = 5.0 kPa, n = 0.6, W = 1.0 × 10−6, and U = 1.0 × 10−12

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Fig. 5

Comparison of og hc/Rx versus log α* characteristics obtained using Eq. (15) and full EHL simulations for a shear-thinning lubricant with Gcr = 10.0 kPa, n = 0.75, W = 5.0 × 10−7, and U = 1.0 × 10−11

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Fig. 2

Comparison of log hc/Rx versus log U characteristics obtained using Eq. (15) and full EHL simulations for a shear-thinning lubricant with Gcr = 50.0 kPa, n = 0.5, α* = 15.0 GPa−1

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Fig. 8

Comparison of log hc versus log uo characteristics obtained using Eq. (15) and experimental data for PAO mixture [44] lubricated contacts under pure rolling regime

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Fig. 1

Flow chart of numerical solution procedure [44]

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Fig. 6

Comparison of the effect of contact radius on central film thickness (log hc versus log R characteristics) found using Eq. (15) and full EHL simulations for Newtonian and shear-thinning lubricants

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Fig. 7

Comparison of the effect of maximum Hertz pressure on central film thickness (log hc versus log pH characteristics) found using Eq. (15) and full EHL simulations for Newtonian and shear-thinning lubricants

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Fig. 9

Comparison of log hc versus log uo characteristics obtained using Eq. (15) and experimental data for PAO [39] lubricated contacts under pure rolling regime

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Fig. 10

Comparison of log hc versus log uo characteristics obtained using Eq. (15) and experimental data for PDMS [38] lubricated contacts under pure rolling regime

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Fig. 11

Comparison of (hcS) characteristics obtained using Eq. (15) and experimental data for PAO-650 oil [39]

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