Abstract
The collective collapse of bubble clouds or clusters is important to many applications, including underwater sound propagation, shock-wave lithotripsy, and focused ultrasound therapy. Energetic collective cluster collapses appear to happen only when there is sufficient nuclei density. In order to study this phenomenon, we have implemented a laser-based method for creating clusters consisting of planar or cubic arrays of bubbles with controllable interbubble spacing. The growth and collapse of the arrays are observed using ultrahigh-speed photography and other diagnostics. Effects of interbubble spacing and nucleation phase with respect to the acoustic period are studied. [Work supported by the US Army Space and Missile Command.]
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