• COMBINED EFFECTS OF SURFACE ROUGHNESS AND NON-NEWTONIAN COUPLE STRESSES ON SQUEEZE FILM CHARACTERSTICS BETWEEN PARALLEL STEPPED PLATES

Abstract

In this paper, an attempt has been made to investigate the theoretically the combined effects of surface roughness and couple stresses on the squeeze film characteristics between parallel stepped plates. On the basis of Christensen’s stochastic theory, two types of roughness structures, namely, the longitudinal roughness and transverse roughness patterns are considered and the stochastic modified Reynolds equation for these two types of roughness patterns is derived for couple stress fluid. A closed form expressions are obtained for the mean load carrying capacity and squeeze film time. It is found that the squeeze film characteristics are improved for transverse roughness pattern. Where as, the performance of the squeeze film bearing suffers due to the presence of longitudinal roughness pattern.