Deflection of cavitation bubble near the rigid wall with a gas-containing hole

The presence of a rigid wall causes a microjet of the cavitation bubble to collapse to move toward the wall, while a free surface does the opposite. When a rigid wall surface is combined with a free surface, it may affect the direction of the microjet. The motive of this study is to find out the influence of the dynamic behavior of a laser-induced bubble near the rigid wall with a gas-containing hole. Evolutions of the bubble at different distances from the gas-containing hole in the horizontal and vertical directions were recorded by a high-speed camera (2.3×105 fps). When the bubble collapse near the boundary, the bubble will produce two situations: away from or toward the boundary. It focuses on the direction of the bubble, the oscillation period of a bubble, and reflection angle, and quantitative analysis of the results. It was found that the boundary not only changes the morphologic of the bubble and the overall direction of movement but also affects the oscillation period. In addition, it can control the deflection of the bubble.