Cavitation Growth Phenomena in Pure-Sliding Grease EHD Contacts

Abstract

This article describes experimental and theoretical studies on the cavitation phenomena in the grease lubrication film under pure sliding elastohydrodynamic contact. In situ observation tests using the optical interferometry technique were conducted, and the growth of cavitation was captured using a high-speed camera. The results showed that the cavity grew in two stages, which was similar to the behavior in the base oil, and that the cavity growth rate in the initial stage was higher than that in the second stage. In the initial stage, the cavity growth time in the grease was longer than that in the base oil, and the cavity length after the growth depended on the base oil viscosity. It was also found in the test using diurea grease that small cavities were formed by the lumps of thickener. The cavity growth in the initial stage was discussed by numerical simulation of pressure distribution based on a simple rheological model.

Numerical prediction of oil film shear cavitation inception considering groove structure

“…Chen et al 13 investigated the evolution of unsteady sheet/cloud cavitating flow, both the experimental and computational results indicate that the cavitation development process can be divided into three main stages: growth, shedding, and collapse. In situ observation tests on the cavitation phenomenon in the grease lubrication film were conducted by Otsu et al, 14 in which the growth process of cavitation was captured by a high-speed camera.…”

“…Chen et al 13 investigated the evolution of unsteady sheet/cloud cavitating flow, both the experimental and computational results indicate that the cavitation development process can be divided into three main stages: growth, shedding, and collapse. In situ observation tests on the cavitation phenomenon in the grease lubrication film were conducted by Otsu et al, 14 in which the growth process of cavitation was captured by a high-speed camera. To study the cavitation action of the oil film and the effect of cavitation on the hydrodynamic performances, Li et al 15 established a hydrodynamic lubricant model with a JFO cavitation boundary and conducted the visual experiments of cavitation under different working conditions.…”