Effects of viscosity‐pressure dependency on the non‐Newtonian squeeze film of parallel circular plates

Abstract

On the basis of the Barus experimental research, the viscosity of an incompressible lubricant grows exponentially with its pressure. Therefore, the squeeze film issues between parallel circular plates lubricated with a non‐Newtonian couple‐stress fluid are reexamined in the present study by considering the effects of viscosity‐pressure dependency. According to the results, the influences of viscosity‐pressure dependency raise the load capacity and lengthen the approaching time of the plates. Numerical results under different values of the viscosity parameter and the non‐Newtonian parameter are also provided in tables for engineering applications. Copyright © 2012 John Wiley & Sons, Ltd.

Effect of Surface Roughness and Viscosity-Pressure Dependency on the Couple Stress Squeeze Film Characteristics of Parallel Circular Plates

“…According to the study by Gould [20], the variation of viscosity with pressure is important especially in the high pressure squeeze films. Lin et al [21,22] analyzed the theoretical study of combined effects of non-Newtonian couple stress rheology and viscosity pressure dependency (VPD) in the sphere plate squeeze film and squeeze film circular plates. Reddy et al [23] predicted the effect of viscosity variation on the squeeze film performance of narrow hydrodynamic journal bearings with couple stress fluid.…”

“…Recently, Lin et al [22] have studied the effects of viscosity-pressure dependency on the non-Newtonian squeeze film of parallel circular plates with an assumption that bearing surfaces are smooth. Hence the main objective of this paper is to study the effects of surface roughness on the couple stress squeeze film lubrication between circular plates by considering the pressure dependent viscosity variation which has not been studied so far.…”

Investigation of Couple Stress Fluid and Surface Roughness Effects in the Elastohydrodynamic Lubrication Problems using Wavelet-Based Decoupled Method

“…The constitutive relationship for couple stress fluids is presented by Stokes [3] in the analysis to derive the modified Reynolds equation in terms of a dimensionless couple stress parameter which represents the molecular length of the additives. The surface roughness is assumed to be single-sided, transverse, and sinusoidal [4][5][6][7].…”

Effect of Piezoviscous Dependency and Couple Stress on Squeeze Film Lubrication Between Parallel Stepped Plates

“…Lin et.al. (18,19,20) studied the effect of viscosity pressure dependency (VPD) on the non-Newtonian squeeze film of circular plates and long partial journal bearings. They found that the couple stress fluid and the effect of pressure dependent viscosity causes an increase in the load carrying capacity and lengthens the squeeze film time.…”