The Viscosity of PAO Mixtures at High Pressure and Stress

[+] Author and Article Information
Scott Bair

Georgia Institute of Technology, Center for High-Pressure Rheology, George W. Woodruff School of Mechanical Engineering, Atlanta, GA 30332-0405

Samuel Flores-Torres

Products Research & Technology Department, ExxonMobil Research & Engineering, 600 Billingsport Road - Room #48-104, Paulsboro, NJ 08066-0480

1Corresponding author.

ASME doi:10.1115/1.4041124 History: Received April 13, 2018; Revised August 03, 2018


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.

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