An Application of a Free Volume Model to Lubricant Rheology 2—Variation in Viscosity of Binary Blended Lubricants

[+] Author and Article Information
S. Yasutomi, S. Bair, W. O. Winer

School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Ga. 30332

J. Tribol 106(2), 304-311 (Apr 01, 1984) (8 pages) doi:10.1115/1.3260911 History: Received April 18, 1983; Online October 29, 2009


The modified WLF equation developed in Part 1 was applied to the variation in viscosity, μ(T,P), for two series of binary blended lubricants containing a common synthetic diester (di(2ethylhexyl)sebacate) in a polyphenyl ether (5P4E) and in a naphthenic mineral oil (N1). Dilatometric observations and the viscosity analysis indicate that the relations needed to predict the pressure functions in the modified WLF equation for the binary mixture can be obtained from those of respective components. These relations allow us to estimate μ(T,P) of a binary blended lubricant without measurements of the high pressure viscosity of the blend. For practical applications, the modified WLF equation may also be useful for predicting μ(T,P) of blended lubricant products.

Copyright © 1984 by ASME
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