MICROPOLAR FLUID LUBRICATION OF FINITE PARTIAL ROUGH POROUS JOURNAL BEARINGS WITH SQUEEZE EFFECT

In this paper, the lubrication theory for squeezing with micropolar fluids in smooth surfaces has been advanced to analyze the effects arising from roughness consideration using the stochastic approach. Basing on the Christensen’s stochastic model, the stochastic generalized Reynolds equation is deduced. The Christensen stochastic theory of hydrodynamic lubrication of rough surface is used to study the effect of two types of surface roughness on the squeeze film characteristics of a finite partial porous journal bearing with micropolar fluid. It is assumed that, the roughness asperity heights are small compared to the film thickness. The film pressure distribution equation is numerically solved by using the conjugate gradient method of iterations. According to the results, the micropolar fluid effects can raise the film pressure of the lubricant fluid, improve the load ?carrying capacity and squeezing effect. The surface roughness effect in the influence of longitudinal or transverse to the journal bearing is in reverse trend.