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Large amplitude radial pulsations of a single, driven gas bubble: Comparison between theory and experiment

In a previous paper [J. Acoust. Soc. Am. Suppl. 1 87, S141 (1990)], the observation of a single gas bubble pulsating radially and acoustically levitated in a stationary wave system at a pressure amplitude on the order of 1.5 bars with a relative pulsation amplitude Rmax/R0⩾3, was reported. This discovery was rather unexpected since the surface instability threshold under these conditions should have been on the order of 0.8 bars [S. Horsburgh, Ph.D. dissertation, University of Mississippi (1990)] and surface instabilities usually result in the break up of the bubble, preventing large radial pulsation amplitudes. The bubble was also observed to be undergoing sonoluminescence, a phenomenon in which light is emitted from the bubble, probably due to the high temperatures associated with the bubble collapse. In this paper, a comparison between the predicted and measured values of the pulsation amplitude, phase of collapse (radial minimum), and the number of radial minima per acoustic period will be presented. ...