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.
Issue Section:
Elastohydrodynamic Lubrication
References
1.
Liu
, Y.
, Wang
, Q. J.
, Wang
, W.
, Hu
, Y.
, Zhu
, D.
, Krupka
, I.
, and Hartl
, M.
, 2006
, “EHL Simulation Using the Free-Volume Viscosity Model
,” Tribol. Lett.
, 23
(1
), pp. 27
–37
.2.
Liu
, Y.
, Wang
, Q. J.
, Bair
, S.
, and Vergne
, P.
, 2007
, “A Quantitative Solution for the Full Shear-Thinning EHL Point Contact Problem Including Traction
,” Tribol. Lett.
, 28
(2
), pp. 171
–181
.3.
Liu
, Y.
, Wang
, Q. J.
, Krupka
, I.
, Hartl
, M.
, and Bair
, S.
, 2008
, “The Shear-Thinning Elastohydrodynamic Film Thickness of a Two-Component Mixture
,” ASME J. Tribol.
, 130
(2
), p. 021502
.4.
Krupka
, I.
, Bair
, S.
, Kumar
, P.
, Khonsari
, M. M.
, and Hartl
, M.
, 2009
, “An Experimental Validation of the Recently Discovered Scale Effect in Generalized Newtonian EHL
,” Tribol. Lett.
, 33
(2
), pp. 127
–135
.5.
Krupka
, I.
, Kumar
, P.
, Bair
, S.
, Khonsari
, M. M.
, and Hartl
, M.
, 2010
, “The Effect of Load (Pressure) for Quantitative EHL Film Thickness
,” Tribol. Lett.
, 37
(3
), pp. 613
–622
.6.
Habchi
, W.
, Bair
, S.
, Qureshi
, F.
, and Covitch
, M.
, 2013
, “A Film Thickness Correction Formula for Double-Newtonian Shear-Thinning in Rolling EHL Circular Contacts
,” Tribol. Lett.
, 50
(1
), pp. 59
–66
.7.
Habchi
, W.
, Vergne
, P.
, Bair
, S.
, Andersson
, O.
, Eyheramendy
, D.
, and Morales-Espejel
, G. E.
, 2010
, “Influence of Pressure and Temperature Dependence of Thermal Properties of a Lubricant on the Behaviour of Circular TEHD Contacts
,” Tribol. Int.
, 43
(10
), pp. 1842
–1850
.8.
Habchi
, W.
, Bair
, S.
, and Vergne
, P.
, 2013
, “On Friction Regimes in Quantitative Elastohydrodynamics
,” Tribol. Int.
, 58
, pp. 107
–117
.9.
Björling
, M.
, Habchi
, W.
, Bair
, S.
, Larsson
, R.
, and Marklund
, P.
, 2013
, “Towards the True Prediction of EHL Friction
,” Tribol. Int.
, 66
, pp. 19
–26
.10.
Björling
, M.
, Habchi
, W.
, Bair
, S.
, Larsson
, R.
, and Marklund
, P.
, 2014
, “Friction Reduction in Elastohydrodynamic Contacts by Thin-Layer Thermal Insulation
,” Tribol. Lett.
, 53
(2
), pp. 477
–486
.11.
Bair
, S.
, Habchi
, W.
, Sperka
, P.
, and Hartl
, M.
, 2016
, “Quantitative Elastohydrodynamic Film Forming for a Gear Oil With Complex Shear-Thinning
,” Proc. Inst. Mech. Eng., Part J
, 230
(3
), pp. 289
–299
.12.
Tuomas
, R.
, and Isaksson
, O.
, 2009
, “Measurement of Lubrication Conditions in a Rolling Element Bearing in a Refrigerant Environment
,” Ind. Lubr. Tribol.
, 61
(2
), pp. 91
–99
.13.
Jonsson
, U. J.
, and Hansson
, N.
, 1998
, “Lubrication Limits of Rolling Element Bearings in Refrigeration Compressors
,” International Compressor Engineering Conference
(ICEC
), West Lafayette, IN, July 14–17, Paper No. 1228.14.
Bair
, S.
, 2000
, “Pressure-Viscosity Behavior of Lubricants to 1.4 GPa and Its Relation to EHD Traction
,” Tribol. Trans.
, 43
(1
), pp. 91
–99
.15.
Geller
, V. Z.
, Paulaitis
, M. E.
, Bivens
, D. B.
, and Yokozeki
, A.
, 1996
, “Viscosities of HFC-32 and HFC-32/Lubricant Mixtures
,” Int. J. Thermophys.
, 17
(1
), pp. 75
–83
.16.
Comuñas
, M. J.
, Baylaucq
, A.
, Boned
, C.
, and Fernandez
, J.
, 2004
, “Dynamic Viscosity for HFC-134a + Polyether Mixtures Up to 373.15 K and 140 MPa at Low Polyether Concentration. Measurements and Modeling
,” Ind. Eng. Chem. Res.
, 43
(3
), pp. 804
–814
.17.
Jonsson
, U. J.
, and Lilje
, K. C.
, 1998
, “Elastohydrodynamic Lubrication Properties of Polyol Ester Lubricants-R134a Mixtures
,” International Compressor Engineering Conference
(ICEC
), West Lafayette, IN, July 14–17, Paper No. 1227.18.
Bair
, S.
, 2015
, “A Critical Evaluation of Film Thickness-Derived Pressure–Viscosity Coefficients
,” Lubr. Sci.
, 27
(6
), pp. 337
–346
.19.
Vergne
, P.
, Fillot
, N.
, Bouscharain
, N.
, Devaux
, N.
, and Morales-Espejel
, G. E.
, 2015
, “An Experimental and Modeling Assessment of the HCFC-R123 Refrigerant Capabilities for Lubricating Rolling EHD Circular Contacts
,” Proc. Inst. Mech. Eng., Part J
, 229
(8
), pp. 950
–961
.20.
Bair
, S.
, 2016
, “A New High-Pressure Viscometer for Oil/Refrigerant Solutions and Preliminary Results
,” Tribol. Trans.
(accepted).21.
Bair
, S.
, Baker
, M.
, and Pallister
, D. M.
, 2016
, “Revisiting the Compressibility of Oil/Refrigerant Lubricants
,” ASME J. Tribol.
, 139
(2
), p. 024501
.22.
Laesecke
, A.
, and Bair
, S.
, 2011
, “High-Pressure Viscosity Measurements of 1, 1, 1, 2-Tetrafluoroethane
,” Int. J. Thermophys.
, 32
(5
), pp. 925
–941
.23.
Bair
, S.
, Mary
, C.
, Bouscharain
, N.
, and Vergne
, P.
, 2013
, “An Improved Yasutomi Correlation for Viscosity at High Pressure
,” Proc. Inst. Mech. Eng., Part J
, 227
(9
), pp. 1056
–1070
.24.
McEwen
, E.
, 1952
, “The Effect of Variation of Viscosity With Pressure on the Load-Carrying Capacity of the Oil Film Between Gear-Teeth
,” J. Inst. Pet.
, 38
(344–345
), pp. 646
–672
.25.
Andrade
, E. D. C.
, 1930
, “The Viscosity of Liquids
,” Nature
, 125
(3148
), pp. 309
–310
.26.
Grunberg
, L.
, and Nissan
, A. H.
, 1949
, “Mixture Law for Viscosity
,” Nature
, 164
(4175
), pp. 799
–800
.27.
Habchi
, W.
, Eyheramendy
, D.
, Vergne
, P.
, and Morales-Espejel
, G. E.
, 2012
, “Stabilized Fully-Coupled Finite Elements for Elastohydrodynamic Lubrication Problems
,” Adv. Eng. Software
, 46
(1
), pp. 4
–18
.28.
Gunsel
, S.
, and Pozebanchuk
, M.
, 1999
, “Elastohydrodynamic Lubrication With Polyolester Lubricants and HFC Refrigerants
,” Air Conditioning and Refrigeration Technology Institute, Arlington, VA, Vol. 1, Final Report No. DOE/CE/23810-102
.29.
Venner
, C. H.
, and Bos
, J.
, 1994
, “Effects of Lubricant Compressibility on the Film Thickness in EHL Line and Circular Contacts
,” Wear
, 173
(1–2), pp. 151
–165
.30.
Habchi
, W.
, and Bair
, S.
, 2012
, “Quantitative Compressibility Effects in Thermal Elastohydrodynamic Circular Contacts
,” ASME J. Tribol.
, 135
(1
), p. 011502
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