CAVITATION BUBBLE DYNAMICS STUDIED BY HIGH-SPEED PHOTOGRAPHY AND HOLOGRAPHY .1.

Bubble dynamics has been recognized as being responsible for many effects in ultrasonic fields, for example cleaning and destruction of surfaces, and emulsification. To improve the performance of ultrasonic devices which make use of these effects some knowledge of the dynamics of cavitation bubbles is needed. One means of studying bubble dynamics is high speed photography in conjunction with some suitable bubble production mechanism to get rid of the statistical appearance of bubbles encountered in ultrasonic cavitation. Results of jet and vortex ring formation obtained with spark- and laser-produced bubbles are reported and demonstrated in a series of frames.