Cavitation in oscillatory porous squeeze film: a numerical approach

Abstract

Purpose This study aims to present a numerical model to investigate cavitation effects on oscillatory porous squeeze film. This effect is able to cause considerable damage to the lubrication mechanisms, mainly in the form of surface erosion. The erosion process is caused by surface spalling due to alternating positive and negative contact stresses imposed by bubble collapse. If the process continues uncontrolled, the performance of the contact will rapidly deteriorate. Design/methodology/approach The study is conducted numerically using Elrod–Adams model for the modified Reynolds equation coupled with the Darcy’s law for the lubricant flow through the porous medium. The governing equations are numerically discretized and iteratively solved. Findings The numerical results show that frequency, amplitude and permeability have a significant influence on the generation of cavitation. A comparison of the present numerical results against available literature experimental data in particular case proved a good agreement. Originality/value The present paper is to develop a more realistic and efficient model. Indeed, the consideration of cavitation phenomena in this model will lead to a more accurate prediction of the squeeze film characteristics. The results of this paper are based on original work and have practical value.

Effects of both cavitation and non-Newtonian behavior on the performance of oscillatory anisotropic poroelastic squeeze film

“…They found that, if viscoelastic effects increase, then the cavitation region widens until reaching a value of Weissenberg number for which a full-film reformation does not occur after the initial film rupture. Recently, Sobhi et al (2022) presented a numerical model to study the effects of cavitation on an oscillating isotropic porous squeeze film lubricated by a Newtonian fluid. Their numerical results show that frequency, amplitude and permeability have a significant influence on cavitation generation.…”