An experimental and numerical study on the dynamical behaviors of the rebound cavitation bubble near the solid wall

Abstract

The final collapse of the rebound cavitation bubble may be more violent than its initial, resulting in more severe damage to the nearby structures. To better understand the dynamical behaviors of the rebound cavitation bubble, the multi-period evolution of the cavitation bubble near the solid wall is investigated experimentally and numerically. Due to multiple factors affecting the rebound cavitation bubble behaviors, a compressible two-phase solver considering phase change and thermodynamic effect simultaneously is developed in OpenFOAM in this study. Validations are conducted by comparing the numerical results with corresponding experimental data. The essential and comprehensive dynamics of the rebound cavitation bubble is well reproduced and analyzed, which helps reveal the underlying physical mechanisms. The potential damage is numerically quantified by the pressure peak at the wall center. The quantitative effect of the dimensionless standoff distance γ on the pressure peaks is analyzed with four distinct stages identified. Moreover, the maximum rebound radius, corresponding to the amount of the initial energy during the rebound stage, and maximum temperature within the bubble at different γ are also discussed. The results show that the maximum rebound bubble radius increases first and then decreases with the increase of γ. In addition, the effect of the γ on the maximum temperature is given with three distinct stages identified.