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research-article

Quantitative Elastohydrodynamic Film-Forming for an Oil/Refrigerant System

[+] 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, USA
scott.bair@me.gatech.edu

Wassim Habchi

Lebanese American University, Department of Industrial and Mechanical Engineering, Byblos, Lebanon
wassim.habchi@lau.edu.lb

Mark Baker

CPI Fluid Engineering, a division of The Lubrizol Corporation 2300 James Savage Road, Midland, Michigan 48642
MRBA@CPIfluideng.com

David M. Pallister

CPI Fluid Engineering, a division of The Lubrizol Corporation 2300 James Savage Road, Midland, Michigan 48642
DAPAL@CPIfluideng.com

1Corresponding author.

ASME doi:10.1115/1.4036171 History: Received September 30, 2016; Revised February 01, 2017

Abstract

The first calculations of film thickness for an oil/refrigerant system using quantitative elastohydrodynamics are reported in this work. It is demonstrated that primary measurements of the properties of the oil/refrigerant system can be employed to accurately predict film thickness in concentrated contacts. An unusual response to lubricant inlet temperature is revealed wherein the film thickness may increase with temperature as a result of decreasing refrigerant solubility in oil when the inlet pressure is high. There is competition between the reduction in viscosity of the oil and the reduction of refrigerant concentration with increased temperature. For high inlet pressure, the dilution effect is dominant, whereas for low inlet pressure, the temperature dependence of the viscosity of the solution dominates over the range of inlet temperatures considered. It seems that only central film thicknesses have been experimentally measured for oil/refrigerant systems leaving these calculations as the only means of assessing the minimum.

Copyright (c) 2017 by ASME
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