Abstract
A theoretical comparison between the steady-state characteristics of isotropic and anisotropic finite hydrostatic double-layered porous journal bearings dealing with the effects of slip flow at the fine porous layer-film interface and percolation of additives into pores under the coupled stress fluid lubrication is presented. Based on the Beavers-Joseph’s criterion for slip flow, the modified Reynolds equation applicable to finite porous journal bearings lubricated with coupled stress fluids have been derived. The governing equations for flow in the coarse and fine layers of porous medium incorporating the percolation of polar additives of lubricant and the modified Reynolds equation are solved simultaneously using finite difference method satisfying appropriate boundary conditions to obtain the steady-state performance characteristics for both isotropic and anisotropic porous bearing. The comparisons between isotropic and anisotropic doubled-layered porous bearings for various steady-state characteristics are exhibited in the form of graphs which may be useful for design of such bearings.
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