The effects of rheological characteristics of lubricant and surface roughness on the load capacity of a hydrodynamic slider bearing

Abstract Using the approximate analytical Reynolds equation for a bearing with a smooth surface as the basis for an analysis, an endeavour is made to provide a non-Newtonian theory for rough surfaces. Generalized forms of one-dimensional Reynolds equations are established for two types of roughness arrangements: transverse and longitudinal. These equations are subsequently used to determine the optimum design for a Rayleigh slider bearing, as an example of an application in engineering. Various bearing characteristics are obtained and compared with those of a smooth bearing with the same nominal film thickness. The calculated results show that both lubricant rheological behaviour and surface roughness have an important influence on the load capacity and friction drag at the surfaces of the bearing.

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