Investigation of velocity slip effect on steady state characteristics of finite hydrostatic double-layered porous oil journal bearing

Abstract

Steady state characteristics of finite hydrostatic double layer porous oil journal bearing are investigated theoretically by incorporating tangential velocity slip at the porous-film interface given by Beavers-Joseph. The governing equations for flow in the porous medium and modified Reynolds equation in the film region are solved simultaneously using finite difference method. The effects of slip and design variables such as feeding parameter, bearing number, eccentricity ratio, slenderness ratio, and anisotropy of permeability have been investigated on bearing performance characteristics like loadcarrying capacity, attitude angle, friction variable, and volume flowrate. The results are depicted in the form of graphs that can be utilized during design.

Comparison between steady-state characteristics of isotropic and anisotropic doubled-layered porous journal bearings under coupled stress lubrication

“…It is also observed by comparing the isotropic bearing with the anisotropic bearing ones that the effect of anisotropic is insignificant even at higher bearing numbers. The similar observation has been reported in reference [9].…”

“…This is due to the fact that a higher value of means a higher permeability coefficient resulting in the lower resistance to the flow of lubricant in the fine porous layer. The similar observation has been reported in references [2,9].…”

“…With the help of appropriate boundary conditions [8,9], equations (2.1-2.3) are solved by finitedifference method with Gauss-Sedial iterative procedure using the over-relaxation scheme. The following convergence criterion has been set to achieve the accuracy of pressure values:…”

“…Few literature [8][9] have been reported so far dealing with the performance of two-layered porous bearings. Saha and Majumder [8] presented the static characteristics and stability characteristics of two-layered hydrostatic porous oil journal bearings without the effect of the slip.…”

“…Saha and Majumder [8] presented the static characteristics and stability characteristics of two-layered hydrostatic porous oil journal bearings without the effect of the slip. Kumar et al [9] presented a theoretical analysis on the finite double-layered hydrostatic porous oil journal bearing, where the steady-state characteristics are analysed including slip effect. But these studies were confined to the porous bearings lubricated with Newtonian fluids.…”