Investigation of Pressure Distributions for a Finite Elastohydrodynamic Journal Bearing Lubricated by Ferro Fluids with Couple Stresses

Abstract

The performance of finite elastohydrodynamic journal bearings lubricated by ferrofluids with couple stresses has been studied. We derive a Reynolds equation that takes into account magneto elastohydrodynamics, by using the continuity and momentum equations. The equation has been integrated locally across the film thickness and an equation for the pressure gradient obtained as a function of film thickness and total mass flow rate of lubricant, the modified Reynolds equation. The modified Reynolds equation obtained is solved numerically by the finite difference technique since it is highly non-linear. The numerical scheme used is implemented in MATLAB so as to obtain the approximate solutions. The pressure distributions are obtained and the solutions obtained represented in graphs. It is clear from the results that the pressure increases with the increase in magnetism and the couple stress.

Influence of lubricants on the performance of journal bearings – a review

“…Results showed that the polymer additives in lubricant significantly increased the stability, load carrying capability and decreased the CoF compared to Newtonian lubricants. The magnetic effect in the couple stress lubricants was studied for hydrodynamic [29] and elasto-hydrodynamic [30] journal bearings and improvement in bearing performance characteristics was found. It was observed that the increase in temperature enhanced the magnetism and couple stress parameter.…”

The Performance of Squeeze Film between Parallel Triangular Plates with a Ferro-Fluid Couple Stress Lubricant

“…Daniel et al [1] applied a numerical method to analyze the performance of an elastohydrodynamic journal bearing which is lubricated with ferrofluids, using couple stresses. By increasing the couple stresses and magnetism, temperature in the bearing increases.…”

“…Also, the effect of Prandtl and Eckert numbers on temperature is investigated in their research. Daniel et al [2] also analyzed magneto-electrohydrodynamics by deriving the Reynolds equation through employing continuum and momentum equations. Pressure distribution in the journal bearing was obtained which indicated an increase in the pressure by enhancement of magnetism and couple stresses.…”