Viscous shear effect in non-Newtonian lubrication of finite porous elastic bearings
Industrial Lubrication and Tribology
ISSN: 0036-8792
Article publication date: 27 November 2018
Issue publication date: 3 April 2019
Abstract
Purpose
The purpose of this study is to investigate the viscous shear effect on finite porous elastic journal bearings lubricated with non-Newtonian couple stress fluid.
Design/methodology/approach
Based on Stokes micro-continuum mechanics, the modified Reynolds equation including bearing deformation was derived. The porous flow was modeled by the complete Darcy–Brinkman equation. To show the viscous shear effects, bearing characteristics including load capacity and friction factor are compared to those obtained from Darcy model with Beavers–Joseph slip conditions (slip flow model [SFM]) by developing a computer program and discussed for different couple stress values, permeabilities and elastic deformation parameters.
Findings
It is found that the viscous shearing forces effects of the Brinkman model increase the load capacity and friction factor compared to those derived using SFM. Moreover, the couple stresses increase the load capacity while decreasing the friction factor for both models.
Originality/value
This study introduces for the first time the viscous effect on finite porous elastic journal bearings lubricated with couple stress fluid.
Keywords
Citation
Sakim, A., Nabhani, M. and El Khlifi, M. (2019), "Viscous shear effect in non-Newtonian lubrication of finite porous elastic bearings", Industrial Lubrication and Tribology, Vol. 71 No. 3, pp. 374-380. https://doi.org/10.1108/ILT-07-2018-0292
Publisher
:Emerald Publishing Limited
Copyright © 2018, Emerald Publishing Limited