Combined effects of micropolarity and surface roughness on the hydrodynamic lubrication of slider bearings

Abstract

In this paper, theoretical analysis of combined effects of micropolarity and surface roughness on the performance characteristics of hydrodynamic lubrication of slider bearings with various film shapes such as plane slider bearing, exponential slider bearing, secant-shaped slider bearing and hyperbolic slider bearing is presented. A stochastic random variable with non-zero mean, variance and skewness is assumed to mathematically model the surface roughness of the slider bearing. The Eringen's (J Math Mech 16:1-18, 1) micropolar fluid is used to characterize the rheological behavior of the lubricant with polymer additives. The averaged modified Reynolds equation is derived and the closed form of expressions for the bearing characteristics such as load carrying capacity, frictional force, center of pressure are obtained. Numerical results are compared for various film shapes under consideration, the negatively skewed surface roughness increases the load carrying capacity, frictional force and temperature. © 2013 The Brazilian Society of Mechanical Sciences and Engineering.