Abstract
This study investigates the lubrication characteristics of a textured bearing sliding on a porous layer. To properly implement the porous layer effect in the bearing, the Brinkman-extended-Darcy model is employed, which results in a modified Reynolds equation. This equation is then evaluated to examine the effects of the porous layer’s material and geometric properties on the lubrication characteristics through the use of (semi-)analytic and numerical approaches. The cavitation effect is reflected in the numerical treatment of the model equation, and an adaptive finite difference scheme is employed to efficiently model the bearing system with finite dimples that may be far smaller than the overall bearing dimensions. Along with the variation trends of the bearing performance with respect to the material and geometric properties of the porous layer, the pattern effects of textured surfaces on the bearing performance indices (load capacity and equivalent friction coefficient) are also thoroughly investigated. Here, the pattern comprised a set of regularly spaced identical dimples either in semi-spherical or semi-ellipsoidal shape, and the effects of size and orientation of the dimples are comprehensively explored to separately identify their influence on the bearing performance indices.
Highlights
Most of the machinery used in modern industry strongly demands the use of environmentally conscious or energy-efficient components, including various moving small components, which are directly or indirectly in contact with each other
We performed an analysis on the planar bearing with a textured surface sliding over a porous layer using the modified Reynolds equation incorporated with the Brinkman-extended-Darcy model.[20]
Stress jump factor, and permeability on the lubrication characteristics of the planar journal bearing with a porous layer
Summary
Most of the machinery used in modern industry strongly demands the use of environmentally conscious or energy-efficient components, including various moving small components, which are directly or indirectly in contact with each other. Ochoa-Tapia and Whitaker[26,27] performed both theoretical and empirical studies on the stress jump condition and effective viscosity in the boundary layer between the porous medium and the free flow region by introducing a volume averaging technique. Li28 proposed a fluid flow model to solve the thin-film lubrication problem on porous media by extensively using the Brinkman-extended-Darcy equation incorporated with the stress jump condition and the viscosity ratio. We performed an analysis on the planar bearing with a textured surface sliding over a porous layer using the modified Reynolds equation incorporated with the Brinkman-extended-Darcy model.[20] The material properties including permeability, stress jump factor, and viscosity ratio are varied, dependently or independently, to examine their effects on the bearing characteristics including the load capacity (LC) and the equivalent friction coefficient (EFC).
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