Hostname: page-component-cd9895bd7-dk4vv Total loading time: 0 Render date: 2024-12-25T16:01:07.289Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Lubricant Compressibility on Hydrodynamic Behavior of Finite Length Journal Bearings Running under Heavy Load Conditions

Published online by Cambridge University Press:  15 July 2015

M. Besanjideh  and
S. A. Gandjalikhan Nassab
M. Besanjideh*
Affiliation:
Department of Mechanical Engineering, School of Engineering, Shahid Bahonar University, Kerman, Iran
S. A. Gandjalikhan Nassab
Affiliation:
Department of Mechanical Engineering, School of Engineering, Shahid Bahonar University, Kerman, Iran
*
*Corresponding author ([email protected])
Get access

Abstract

The journal bearings which are designed for heavy-duty operations could experience different lubricant density due to high bearing loads. In the present work, hydrodynamic behaviour of finite length journal bearings under laminar and isoviscous flow with variable density are investigated. For this purpose, three-dimensional continuity and momentum equations along with a proper density-pressure relation are solved numerically, using CFD technique. Also, an appropriate cavitation model based on mass conservation is involved in the computation. Because of complex geometry of journal bearing, a conformal mapping is employed to generate an orthogonal grid and the governing equations are transformed in the computational domain. Since the degree of oil compressibility can be depended to the type of lubricant, typical mineral and synthetic oils treatments are modelled, separately. Results indicate that the oil compressibility effect leads to increasing load carrying capacity such that this increase is slightly more for the synthetic oil.

Keywords

Journal bearingCompressibility effectMineral oilSynthetic oil
Type
Research Article
Information
Journal of Mechanics , Volume 32 , Issue 1 , February 2016 , pp. 101 - 111
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2016 

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1.Heshmat, H., Tribology of Interface Layers, 1st Edition, Taylor & Francis group, New York, pp. 1–14 (2010).CrossRefGoogle Scholar
2.Chun, S.M., “Thermohydrodynamic Lubrication Analysis of High-Speed Journal Bearing Considering Variable Density and Variable Specific Heat,” Tribology International, 37, pp. 405–413 (2004).Google Scholar
3.Leeuwen, H. V., “The Determination of the Pressure-Viscosity Coefficient of a Lubricant Through an Accurate film Thickness Formula and Accurate film Thickness Measurements,” Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 223, pp. 1143–1163 (2009).Google Scholar
4.Zheming, Z. and Wenkang, S., “A New Method for the Numerical Solution of the Reynolds Equation at Low Spacing,” Journal of Tribology, 115, pp. 83–87 (1993).Google Scholar
5.Wu, L. and Bogy, D. B., “New First and Second Slip Models for the Compressible Reynolds Equation,” Journal of Tribology, 125, pp. 558–561 (2003).CrossRefGoogle Scholar
6.Wang, N., Huang, H. C. and Chang, S. H., “Comparison of Iterative Methods for the Solution of Compressible-Fluid Reynolds Equation,” Journal of Tribology, 133, p. 021702-1-7 (2011).CrossRefGoogle Scholar
7.Qiu, M., Bailey, B. N., Stoll, R. and Raeymaekers, B., “The Accuracy of the Compressible Reynolds Equation for Predicting the Local Pressure in Gas-Lubricated Textured Parallel Slider Bearings,” Tribology International, 72, pp. 83–89 (2014).Google Scholar
8.Gandjalikhan Nassab, S. A., “Inertia Effect on the Thermohydrodynamic Characteristics of Journal Bearings,” Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 219, pp. 459–467 (2005).CrossRefGoogle Scholar
9.Elrod, H. G., “A Cavitation Algorithm,” Journal of Lubrication Technology, 103, pp. 350–354 (1981).Google Scholar
10.Sahlin, F., Almqvist, A., Larsson, R. and Glavatskih, S., “A Cavitation Algorithm for Arbitrary Lubricant Compressibility,” Tribology International, 40, pp. 1294–1300 (2007).Google Scholar
11.Dowson, D. and Higginson, G. R., Elasto-Hydrodynamic Lubrication, 1st Edition, Pergamon Press, Oxford, UK (1966).Google Scholar
12.Tuomas, R. and Isaksson, O., “Compressibility of Oil/Refrigerant Lubricant in Elasto-hydrodynamic Contacts,” Journal of Tribology, 128, pp. 218–220 (2006).Google Scholar
13.Gandjalikhan Nassab, S. A., Sohi, H. and Zaim, E. H., “Study of Lubricant Compressibility Effect on Hydrodynamic Characteristics of Heavily Loaded Journal Bearings,” Transactions of Mechanical and Materials Engineering, 35, pp. 237–241 (2011).Google Scholar
14.Ramesh, K. T., “The Short-Time Compressibility of Elastohydrodynamic Lubricants,” Journal of Tribology, 113, pp. 361–371 (1991).Google Scholar
15.Jacobson, B. O. and Vinet, P., “A Model for the Influence of Pressure on the Bulk Modulus and the Influence of Temperature on the Solidification Pressure for Liquid Lubricants,” Journal of Tribology, 109, pp. 709–714 (1987).Google Scholar
16.Gandjalikhan Nassab, S. A. and Moayeri, M. S., “Three-Dimensional Thermohydrodynamic Analysis of Axially Grooved Journal Bearings,” Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 216, pp. 35–47 (2002).Google Scholar
17.Gandjalikhan Nassab, S. A. and Maneshian, B., “Thermohydrodynamic Analysis of Cavitating Journal Bearings Using Three Different Cavitation Models,” Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology, 221, pp. 501–513 (2007).Google Scholar
18.Patankar, S. V. and Spalding, B. D., “A Calculation Procedure for Heat, Mass and Momentum Transfer in Three Dimensional Parabolic flow,” International Journal of Heat and Mass Transfer, 15, pp. 1787–1806 (1972).Google Scholar
19.Ferron, J., Frene, J. and Boncompain, R. A., “Study of the Thermohydrodynamic Performance of a Plane Journal Bearing; Comparison Between Theory and Experiments,” Journal of Lubrication Technology, 105, pp. 422–438 (1983).CrossRefGoogle Scholar
20.Pan, C. H. T. and Vohr, J. H., “Super Laminar flow in Bearings and Seals,” Bearing and Seal Design in Proceedings of the International Symposium on Lubrication in Nuclear Application, New York, pp. 219–250 (1967).Google Scholar