Squeeze Film Characteristics of Couple Stress Fluid Between Porous Triangular Plates

Abstract

A theoretical study of hydrodynamic squeeze film behaviour for triangular plates is analysed. The upper nonporous triangular plate is approaching the homogenous and isotropic lower porous triangular plate. The lubricant between the plates is a couple stress fluid with no body forces and body couples. On the basis of microcontinuum, theory, the Stokes constitutive equations are solved and the modified Reynolds equation is derived. It is assumed that the polymer additives present in the lubricant do not percolate in the lower porous plate ie., it is assumed that the size of the polar additives present in the couple stress is much greater than the pore size of the lower plate. An expression for squeeze film pressure is obtained. The load carrying capacity of the squeeze film is obtained by using the squeeze film pressure. The bearing characteristics of the couple stress lubricant are then obtained and the results are compared to the Newtonian case. The results reveal that the presence of micro structures in the fluid film cause an enhancement of squeeze film characteristics showing that couple stress lubricants are better fluids than Newtonian fluids.