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Research Papers: Elastohydrodynamic Lubrication

Quantitative Elastohydrodynamic Film-Forming for an Oil/Refrigerant System

[+] Author and Article Information
Scott Bair

Center for High-Pressure Rheology,
George W. Woodruff School of Mechanical
Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332-0405
e-mail: scott.bair@me.gatech.edu

Wassim Habchi

Department of Industrial and Mechanical
Engineering,
Lebanese American University,
F#69, P.O. Box 36,
Byblos 1401, Lebanon;
Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: wassim.habchi@lau.edu.lb

Mark Baker

CPI Fluid Engineering,
The Lubrizol Corporation,
2300 James Savage Road,
Midland, MI 48642
e-mail: MRBA@CPIfluideng.com

David M. Pallister

CPI Fluid Engineering,
The Lubrizol Corporation,
2300 James Savage Road,
Midland, MI 48642

1Corresponding author.

2At the time the work was done, Wassim Habchi was a visiting scholar at Georgia Institute of Technology.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received September 30, 2016; final manuscript received February 1, 2017; published online June 7, 2017. Assoc. Editor: Wang-Long Li.

J. Tribol 139(6), 061501 (Jun 07, 2017) (7 pages) Paper No: TRIB-16-1303; doi: 10.1115/1.4036171 History: Received September 30, 2016; Revised February 01, 2017

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.

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References

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Figures

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Fig. 1

Validation of the new EoS at 50 °C. R134a from Ref. [22].

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Fig. 2

Mixing chart for the oil/refrigerant system

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Fig. 3

Comparing the present simulation with experiment of Gunsel and Pozebanchuk [28]

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Fig. 4

Central film thickness for Hertz pressure of 0.7 GPa and 1 m/s versus inlet temperature for three inlet pressures

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Fig. 5

Minimum film thickness for Hertz pressure of 0.7 GPa and 1 m/s versus inlet temperature for three inlet pressures

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Fig. 6

The viscosity at p = 100 MPa as a function of inlet temperature for three inlet pressures

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Fig. 7

Volume at p = 0.7 GPa relative to the volume at ambient pressure as a function of inlet temperature for three inlet pressures

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