Abstract
The pressure wave produced by the collapse of an electrically generated spherical cavity (∼1 cm in radius) in water was measured by means of a small electroacoustic hydrophone (116 in. in diameter) at a distance of 50 cm. The pressure was found to increase as the bubble collapsed according to the t−4/5 (time) law in the interval corresponding to subsonic flow. The pressure then suddenly jumped to a higher value and rapidly decayed to zero. This rapid increase in pressure is assumed to be a shock wave. Using Gilmore's theory for the collapse of the cavity and finite amplitude-wave theory for the pressure wave, we find that the value of the pressure-amplitude characteristic at the shock front corresponds to a cavity-wall velocity approximately equal to the velocity of sound. Since the shock wave has been attenuated, the peak wall velocity must be greater than this value.
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