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Research Papers: Elastohydrodynamic Lubrication

Lubricant Selection for Minimum Traction in Elastohydrodynamic Lubrication Line Contacts During Accelerated Motion—A Numerical Approach

[+] Author and Article Information
Niraj Kumar

Department of Mechanical Engineering,
National Institute of Technology Kurukshetra,
Kurukshetra, Haryana 136119, India
e-mail: niraj_me01336@yahoo.com

Punit Kumar

Department of Mechanical Engineering,
National Institute of Technology Kurukshetra,
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 March 5, 2016; final manuscript received January 6, 2017; published online May 26, 2017. Assoc. Editor: Ning Ren.

J. Tribol 139(5), 051502 (May 26, 2017) (5 pages) Paper No: TRIB-16-1072; doi: 10.1115/1.4036167 History: Received March 05, 2016; Revised January 06, 2017

Transient thermal elastohydrodynamic lubrication (EHL) line contact simulations are carried out to study the traction behavior during accelerated motion considering realistic shear-thinning behavior. Using three lubricants with different inlet viscosity and shear-thinning parameters, the application of present analysis for lubricant selection is demonstrated. Owing to squeeze film action, the film evolution is delayed, and EHL traction during acceleration is found to increase much above the designed value. This effect decreases with increasing starting speed. The most shear-thinning test oil considered here yields the lowest traction coefficient with minimum variation in its value desirable for smooth and vibration-free operation.

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Figures

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Fig. 1

Variation of rolling speed with time at different values of acceleration

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Fig. 2

Comparison of shear-thinning patterns for the three test oils

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Fig. 3

Variation of traction coefficient with time at f = 0.098 m/s2

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Fig. 4

Variation of central film thickness with time at f = 0.098 m/s2

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Fig. 5

Variation of traction coefficient with time at f = 0.196 m/s2

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Fig. 6

Variation of central film thickness with time at f = 0.196 m/s2

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Fig. 7

Variation of maximum fluid temperature with time at f = 0.098 m/s2

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Fig. 8

Effect of starting speed on transient traction characteristics for oil-1

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