The Eyring sinh law, which is the most widely used model to describe the shear-thinning behavior of elastohydrodynamic lubrication (EHL) lubricants, fails to replicate the experimentally measured flow curves for shear-thinning lubricants. Interestingly, this law was rejected by Eyring for shear-thinning fluids and, in fact, it was found useful only for fluids thought to exhibit thixotropy. The “actual Ree–Eyring model” for shear-thinning involves multiple flow units with appropriate relaxation times. This paper presents an extensive set of full EHL line and point contact simulations to investigate the usefulness of the actual Ree–Eyring model in EHL applications with shear-thinning lubricants. Comparisons with published experimental data establish the validity of the actual Ree–Eyring model. Also presented is the application of an appropriate shifting rule expected to improve the agreement between simulations and experiments.
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e-mail: khonsari@me.lsu.edu
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January 2009
Research Papers
Full EHL Simulations Using the Actual Ree–Eyring Model for Shear-Thinning Lubricants
Punit Kumar,
Punit Kumar
Department of Mechanical Engineering,
Louisiana State University
, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803
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M. M. Khonsari,
M. M. Khonsari
Department of Mechanical Engineering,
e-mail: khonsari@me.lsu.edu
Louisiana State University
, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803
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Scott Bair
Scott Bair
Center for High-Pressure Rheology, George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405
Search for other works by this author on:
Punit Kumar
Department of Mechanical Engineering,
Louisiana State University
, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803
M. M. Khonsari
Department of Mechanical Engineering,
Louisiana State University
, 2508 Patrick Taylor Hall, Baton Rouge, LA 70803e-mail: khonsari@me.lsu.edu
Scott Bair
Center for High-Pressure Rheology, George W. Woodruff School of Mechanical Engineering,
Georgia Institute of Technology
, Atlanta, GA 30332-0405J. Tribol. Jan 2009, 131(1): 011802 (6 pages)
Published Online: December 4, 2008
Article history
Received:
April 16, 2008
Revised:
September 20, 2008
Published:
December 4, 2008
Citation
Kumar, P., Khonsari, M. M., and Bair, S. (December 4, 2008). "Full EHL Simulations Using the Actual Ree–Eyring Model for Shear-Thinning Lubricants." ASME. J. Tribol. January 2009; 131(1): 011802. https://doi.org/10.1115/1.3002328
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