The Effects of Fluid Inertia Forces in Squeeze Film Bearings Lubricated with Pseudo-plastic Fluids : 2nd Report, Annular Pavallel Plates Squeeze Film Bearings

Abstract

In this paper, the effects of fluid inertia forces in annular parallel plate squeeze film bearings lubricated with pseudo-plastic fluids are investigated theoretically. The cubic equation obtained from the empirical flow curves for the pseudo-plastic fluids is used as the relation between shear stress and shear strain rate. Approximating the inertia term in the momentum equation by the mean value averaged across the film thickness, a lubrication equation for calculating the film pressure of annular parallel plate squeeze film bearings is derived. Applying the lubrication equation to the annular bearings under the sinusoidal squeeze motion, the effects of inertia forces on the film pressure are examined for various nonlinear factor.