A high-pressure chamber is used to study lubricant compressibility when refrigeration oil is diluted by refrigerant. The tested lubricant in this work is a POE (polyol ester) oil, POE diluted with nonchlorinated (HFC) refrigerant R-134a, a naphthenic mineral oil, and the mineral oil diluted with the chlorinated (HCFC) refrigerant R-22. The high-pressure chamber experiments show that by adding 20 wt% of R-134a to the polyol ester oil, the stiffness of the lubricant increases by approximately 38 wt% at 1 GPa and is much higher than for R-22 and mineral oil.
Issue Section:
Technical Briefs
1.
Dowson
, D.
, and Higginson
, G. R.
, 1966, Elastohydrodynamic Lubrication, The Fundamentals of Roller and Gear Lubrication
, 1st ed., Pergamon Press
, Oxford, UK, p. 89
.2.
Hamrock
, B. J.
, Jacobson
, B. O.
, and Bergström
, S-I.
, 1987, “Measurement of the Density of Base Fluids at Pressures to 2.2 GPa
,” NASA TM-87114.3.
Jacobson
, B. O.
, and Vinet
, P.
, 1987, “A Model for the Influence of Pressure on Bulk Modulus and the Influence of Temperature on the Solidification Pressure for Liquid Lubricants
,” ASME J. Tribol.
0742-4787, 109
, pp. 709
–714
.4.
Ståhl
, J.
, and Jacobson
, B. O.
, 2003, “Compressibility of Lubricants at High Pressures
,” Tribol. Trans.
1040-2004, 46
(4
), pp. 592
–599
.5.
Lindqvist
, S.
, 1995, “Compressibility and Density of Lubricants in Transient Loading
,” Licenciate Thesis, 1995:35:1, Luleå University of Technology, Luleå, Sweden.6.
Vinet
, P.
, Ferrante
, J.
, Smith
, J. R.
, and Rose
, J. H.
, 1986, “A Universal Equation of State for Solids
,” Solid State Phys.
0081-1947, 19
, pp. 467
–473
.7.
Jacobson
, B. O.
, 2000, “A New High Pressure Chamber for Lubricant Investigations
,” Proceedings of the International Tribology Conference, Nagasaki, Japan, 2000
, ISBN 4-9900139-5-6, pp. 1199
–1202
.8.
Höglund
, E.
, 1999, “Influence of Lubricant Properties on Elastohydrodynamic Lubrication
,” Wear
0043-1648, 232
(2
), pp. 176
–184
.Copyright © 2006
by American Society of Mechanical Engineers
You do not currently have access to this content.
