Variations in viscosity within the film is known to have a pronounced effect on journal bearing performance. Lubricants of the same grade with the same viscosity at a particular temperature and ambient pressure can have different viscosity values at other temperatures and pressures. The effect of rate of viscosity variation due to the changes in temperature and pressure on the performance of an axial grooved journal bearing is the focus of this investigation. Roelands’ model on viscosity-temperature-pressure relationship of lubricants is adopted. Cavitation modelling with regard to thermal effects and mass conservation are carefully considered. A total THD model with heat transfer within the fluid film and heat dissipation to the ambient through the journal and bush, is utilized. For different rates of viscosity variation with respect to temperature and pressure, comparison of performance parameters and typical temperature distributions are presented.

Issue Section:
Research Papers
Topics:
Journal bearings, Viscosity, Temperature, Pressure, Lubricants, Cavitation, Energy dissipation, Fluid films, Heat, Heat transfer, Modeling, Temperature distribution, Temperature effects
1.
Anderson, D. A., Tennehill, J. C., and Pletcher, R. H., 1984, Computational Fluid Mechanics and Heat Transfer, Hemisphere, New York, pp. 99–117.
2.
Douglas
J.
, and
Gunn
J. E.
,
1964
, “
A General Formulation of Alternating Direction Methods—Part I: Parabolic and Hyperbolic Problems
,”
Numerische Mathematik
, Vol.
6
, pp.
428
–
453
.
3.
Dowson
D.
,
Hudson
J.
,
Hunter
B.
, and
March
C.
,
1966–67
, “
An Experimental Investigation of the Thermal Equilibrium of Steadily Loaded Journal Bearings
,”
Proc. Inst. of Mech. Engr.
, Vol.
101
, Part 3B, pp.
70
–
80
.
4.
Elrod
H. G.
,
1981
, “
A Cavitation Algorithm
,”
ASME JOURNAL OF LUBRICATION TECHNOLOGY
, Vol.
103
, pp.
350
–
354
.
5.
Elrod
H. G.
,
1991
, “
Efficient Numerical Method for Computation of Thermo-hydrodynamics of Laminar Lubricating Films
,”
ASME JOURNAL OF TRIBOLOGY
, Vol.
113
, pp.
506
–
511
.
6.
Elrod, H. G., and Vijayaraghavan, D., 1995, “Film Temperatures in the Presence of Cavitation,” NASA CR-195481. US Army ARL-CR-231.
7.
Jones
W. R.
,
Johnson
R. L.
,
Winer
W. O.
, and
Sanborn
D. M.
,
1975
, “
Pressure-Viscosity Measurements For Several Lubricants to 5.5 × 108 Newtons per Square Meter (8 × 104 psi) and 149 C (300 F)
,”
ASLE Transactions
, Vol.
18
, No.
4
, pp.
249
–
262
.
8.
Khonsari
M. M.
,
1987
, “
A Review of Thermal Effects in Hydrodynamic Bearings: Part I—Slider and Thrust Bearings; Part II—Journal Bearings
,”
ASLE Transactions
, Vol.
30
, pp.
19
–
33
.
9.
Roelands, C. J. A., 1966, “Correlational Aspects of the Viscosity-Temperature-Pressure Relationship of Lubricating Oils,” PhD Thesis, Univ. of Delft, Netherlands, O.P. Books Program, University Microfilms, Ann Arbor, MI.
10.
Pinkus, O., 1990, Thermal Effects in Fluid Film Tribology, ASME Press, New York.
11.
Vijayaraghavan, D., 1995, “An Efficient Numerical Procedure for Thermohydrodynamic Analysis of Cavitating Films,” To be Presented at STLE-ASME Tribology Conference, Kissimmee, Florida, Oct. 8–11.
12.
Vijayaraghavan
D.
, and
Keith
T. G.
,
1989
,“
Development and Evaluation of a Cavitation Algorithm
,”
Tribology Transactions
, Vol.
32
, No.
2
, pp.
225
–
233
.
This content is only available via PDF.
Copyright © 1998
 by The American Society of Mechanical Engineers
You do not currently have access to this content.