Researches on the Dynamics of the Cavitation Bubble Near the Rigid Wall with a Hole

Abstract When cavitation bubbles collapse near the wall, the micro-jet and shock wave causes damage to the surface of hydraulic machineries. In severe cases, this damage may lead to structural harm. This paper focuses on the cavitation bubble evolution process near the rigid wall with a hole by the experiment and numerical simulation. The space-time morphological characteristics of the bubble at distinct stages (the growth stage, the collapse stage and the rebound stage) are described for the situation of γ=0.7. The distribution of the pressure and the velocity fields at different stages are elucidate. At γ=0.7, a shock wave with a maximum value of the pressure approximately to 14MPa is emitted when the bubble collapses. Meanwhile, a micro-jet attaining a maximum velocity of about 129 m/s is created. Notably, the micro-jet induced by the collapse of a bubble near the rigid wall with a hole is away from the wall, which is different from the micro-jet caused by the collapse of a bubble near the rigid wall.