Dynamics of laser-induced bubble in rigid half sphere

By the very high speed camera technology and numerical calculation, the relation between dimensionless distance and bubble dynamics in a rigid half sphere is determined. The conception of optimum dimensionless distance is presented, and the conflict between cavitation erosion and utility ratio of sound energy is solved. The result shows that, when the ratio of the half sphere radius to the maximum bubble radius is smaller than 1.1, the laser-induced bubble will jump out of the half sphere in the first expanding, and cavitation may appear. The cavitation bubble and cavitation erosion have adverse effects on the transmission of the laser-induced sound. When the ratio is bigger than 1.1 and smaller than 3.3, the laser induced bubble will meet the half sphere before the third collapsing, which