Understanding the pressure and shear dependence of viscosity is essential to an understanding of the mechanisms of film forming and friction in concentrated contacts. The blending of different molecular mass polyalphaolefins (PAOs) may permit the formulator to arrive at a desired combination of film thickness and friction. The viscosities of PAO base oils and their blends were measured versus temperature, pressure, and shear stress to 1 GPa in pressure. The Grunberg–Nissan mixing rule, with effective mole fractions, provides an excellent mixing rule for the temperature and pressure-dependent low-shear viscosity. This work provides the first look at a possible mixing rule for the non-Newtonian response of mixtures of base oils.
The Viscosity of Polyalphaolefins Mixtures at High Pressure and Stress
Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received April 13, 2018; final manuscript received August 3, 2018; published online October 11, 2018. Assoc. Editor: Wang-Long Li.
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Bair, S., and Flores-Torres, S. (October 11, 2018). "The Viscosity of Polyalphaolefins Mixtures at High Pressure and Stress." ASME. J. Tribol. February 2019; 141(2): 021802. https://doi.org/10.1115/1.4041124
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