Abstract
The preliminary results of an experimental study of the underwater sound field emitted by a bubble plume generated by dropping fixed volume of water, held in a cylindrical container, onto a still water surface were previously presented [J. Acoust. Soc. Am. Suppl. 1 88, 514 (1990)]. Further studies of the acoustic and hydrodynamic characteristics of the bubble plume are presented. The high‐speed video images reveal the formation of a cylindrical plume that grows in length until all of the impacting water volume is injected into the still water. As the leading end of the plume advances, a “substructure” separates from the rest of the plume. The onset of the large‐amplitude, low‐frequency sound emission occurs at the instant the substructure detaches. The resonance frequencies of the densely populated substructures are inversely proportional to their radii and are highly dependent on the void fraction. Experimental results are presented which show that detached plumes undergo damped volume oscillations. The ...
Published Version
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