On the squeeze film lubrication of rough short porous partial journal bearings with micropolar fluids

Abstract

In this article, a theoretical study of the effect of surface roughness on the squeeze film characteristics of short porous partial journal bearing lubricated with micropolar fluids is made. The modified averaged Reynolds equation accounting for the randomized surface roughness structure is mathematically derived. The Christensen stochastic theory of hydrodynamic lubrication of a rough surface is used to study the effect of two types of one-dimensional (1D) surface roughness on the squeeze film characteristics of a short porous partial journal bearing with micropolar fluid. It is assumed that the roughness asperity heights are small compared to the film thickness. It is observed that the transverse surface roughness pattern improves the squeeze film characteristics, whereas the squeeze film bearing performance is affected due to the presence of 1D longitudinal surface roughness. These effects are more pronounced for the micropolar fluids.