Acoustically induced cavitation at 20 kHz is observed by means of high spee
d CCD recording at a framerate of 2250 per second. Using digital image proc
essing the bubbles' trajectories are reconstructed. The experimental data r
eveal that collision and coalescence of bubbles is a predominant phenomenon
that limits their individual lifetime. Measurements of bubble sizes and ve
locities are in agreement with previous results. (C) 2001 Published by Else
vier Science B.V.