Effect of roughness on journal Bearing performance with non-Newtonian fluids

Jagannath, K (2010) Effect of roughness on journal Bearing performance with non-Newtonian fluids. Journal of Mechanical Engineering, 7 (1). pp. 1-13. ISSN 1823-5514

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Abstract

The present study investigates the effect of surface roughness properties on the steady-state and dynamic characteristics of hydrodynamic journal bearing operating with non-Newtonian lubricants, obeying power-law model. An analytical expression for average film thickness is obtained and introduced in the modified Reynolds equation. The resulting differential equation is then solved by the finite difference method with a successive over-relaxation scheme. The modified Reynolds equation with rough surfaces with Gaussian distribution has been solved by non-linear transient approach to determine the stability parameters considering longitudinal, isotropic and transverse roughness patterns. The equation of motion is solved by fourth-order Runge-Kutta method. The results are compared with the established results for smooth bearings. It is found from the study that the roughness parameters considerably affect the stability of journal bearings. Stability is highest when the bearing is rough than journal. Surface pattern orientation of bearings plays an important role in determining the stable running of a bearing. Improvement in stability not only depends on roughness orientation but also the difference between the roughness of journal and the bearing. Transversely oriented surface with rough bearing gives highest stability. Lower L/D ratios (short bearings) gives higher stability.Non-newtonian effects cause the maximum film pressure to increase. Also non-Newtonian lubricants show flatter pressure distribution which is advantageous for bearings subjected to oscillatory loads.

Item Type: Article
Uncontrolled Keywords: Non-Newtonian lubricants, roughness parameters, Stability
Subjects: Engineering > MIT Manipal > Mechanical and Manufacturing
Depositing User: MIT Library
Date Deposited: 26 Jul 2014 10:07
Last Modified: 26 Jul 2014 10:10
URI: http://eprints.manipal.edu/id/eprint/140240

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