A Flow Visualization Study on the Movements of Solid Particles Propelled by a Collapsing Cavitation Bubble

摘要

The aim of this work is an examination of bubble-particle interaction near a solid boundary in an effort to determine why the addition of particulate to a cavitating flow produces damage that far exceeds that expected by the summation of the cavitation and particulate effects acting independently. High-speed flow visualization technique is applied to the study of the movements of solid particles induced by the collapse of cavitation bubble. The captured images of the particles and the cavitation bubble are analysed to provide trajectories and velocity vectors of the particles. The phenomenon points to a possible explanation on the mechanism of cavitation-particulate erosion on solid surfaces.