Cavitation erosion by laser-generated bubble near rigid boundary

The character and micro-process of cavitation erosion by laser-generated bubble near a rigid boundary in water have been studied with high speed camera system. The experimental results indicate that the main reasons for the boundarys erosion are the bubble collapse-generated shock wave and high speed liquid jet. When the dimensionless quantity, the ratio of the distance from the bubble to the boundary to the maximum radius of the bubble, is from 0.4 to 1.4, the first erosion to the boundary is from the shock wave and the second is from the high speed liquid jet because of the bubbles movement to the surface. When the dimensionless quantity is 1, the liquid jet is the decisive factor of erosion.