EFFECTS OF SURFACE ROUGHNESS ON CURVED PIVOTED POROUS SLIDER BEARINGS LUBRICATED WITH MICROPOLAR FLUIDS

Abstract

In this paper the theoretical analysis of the effect of surface roughness on the hydrodynamic lubrication characteristics of curved pivoted porous slider bearings with micropolar fluids is presented. To account for more realistic situations of the non-uniform rubbing of the bearing surfaces, it is assumed that the probability density function for the random variable characterizing the surface roughness is asymmetrical with the non-zero mean. The generalized average Reynolds type equation is derived for the rough curved
pivoted porous slider bearings with micropolar fluids. The closed form expressions are obtained for the fluid film pressure, load carrying capacity, frictional force and coefficient of friction. It is found that, the performance of the curved pivoted porous slider bearings is improved for the micropolar lubricants as compared to the corresponding Newtonian lubricants. The negatively skewed surface roughness pattern increases fluid film pressure, load carrying capacity, friction force and decreases the co-efficient of friction whereas the adverse effects were found for the positively skewed surface roughness pattern.