Collapsing dynamics and microjet formation of laser-induced cavitation bubble near corrugated solid wall

Abstract

In this work, the volume of fluid method with multiphase flow is applied to numerically study the pulsation process of laser-induced bubbles near corrugated solid surfaces. By changing the distance between the bubble center and the corrugated surface and the laser energy, the pulsation behavior of the bubble, the pressure field, the velocity field, and the variation patterns of the bubble's maximum radius and pulsation period are comprehensively investigated. When the bubble is closest to the corrugated surface, the presence of peaks on both sides causes the bubble to contract inward from both sides, forming a peach shape. Regarding the pressure distribution, the pressure inside the bubble follows a pattern of first decreasing and then increasing. The velocity changes of the microjet generated during the bubble contraction phase are monitored in real-time, which is beneficial for better revealing the impact erosion mechanism of the microjet on complex surface materials.