Abstract
Experimental results are shown for the scattering of ultrasonic pulses by a small volume of air bubbles in water. Two different types of bubblemakers are used to generate the bubble clouds. The first one uses an array of short wires spaced uniformly over a horizontal square area. A transient electronic pulse (of width τ) which has a period T, is simultaneously sent to each individual wire to generate microbubbles through electrolysis. The individual bubble radius generated at each wire is found to depend on the period of the repeated transient pulse. This bubblemaker is used to generate a vertical column of bubbles. The second bubble maker involves the regulation of a transiting volume of air stored in a chamber placed between two solenoid valves. The air escapes through a fine pore fritted disk to produce a transient bubble cloud. Preliminary scattering measurements are presented. Comparisons with theory are made from estimates of the void fraction β, the average bubble radius r0, and other geometrical parameters of the cloud. [Work supported by the Naval Acad. Res. Council.]
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