Abstract
Abstract The paper presents, surface roughness effect for thermo-hydrodynamic analysis of journal bearings extended to couple stress lubricants with high polymer additives. A modified energy equation is simultaneously solved with heat transfer equation as well as modified Reynolds equation by using Multigrid method. The effects of couple stress and surface roughness on the performances of a finite journal bearing are presented in detail. Further, it is shown that lubricants with couple stress and surface roughness, not only increases the load capacity and decreases the friction coefficient, but also generates a lower bearing temperature field. Thus, the lubricant with couple stress improves the performance of journal bearings. The characteristics of bearing are compared with numerical results.
Highlights
The performance of journal bearings with thermal effects in lubrication process is analysed by thermal hydrodynamic lubrication (THD)
The microcontinuum fluid mechanics accounts for intrinsic motion of material constituents in order to extend the range of application, for example, to describe the flow of complex fluids, polymer molecules are used in polymeric suspensions
The classical continuum fluid mechanics is generalized by non-polar theory of fluids, which is characterized by classical Cauchy stress
Summary
The performance of journal bearings with thermal effects in lubrication process is analysed by thermal hydrodynamic lubrication (THD). A study of a journal bearing lubricated with a couple stress fluids including elasticity of the linear is presented by Mokhiamer et al [11]. Lin [12] analysed the study of squeeze film characteristics of finite journal bearings assuming the lubricant to be an incompressible fluid with couple stress. In most of the theoretical studies of film lubrication it was more or less assumed that the bearing surfaces could be presented by smooth mathematical planes. This appears to be an unrealistic assumption in bearing, working with small film thickness. The aim of this paper is to present the THD performance of journal bearings lubricated with couple stress fluids with surface roughness effect. The various effects which include temperature field, load carrying capacity, friction force, friction coefficient and end leakage are analysed in detail for different couple stress parameters
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