An Experimental Study on the Collapse of Multiple Air Bubbles by a Shock Wave

Abstract

An experimental study was made on the collapse of multiple air bubbles by a shock wave using a water shock tube and a high speed camera. High speed schlieren photographs show the processes of a high pressure region formation or of shock wave formation near multiple air bubbles when they rebound. Two impulsive pressures, 0.72 and 1.75 MPa, were applied to multiple air bubbles with an initial radius of about 1.2 mm. It is shown that in the case of impulsive pressure 1.75 MPa, the multiple air bubbles produce weak shock waves around themselves when they rebound.