Abstract
The shape of a bubble in water should change in response to the radiation pressure of an ultrasonic wave. Furthermore, modulation of the radiation pressure at the resonance frequencies for shape oscillations should facilitate the stable excitation of such modes [P. L. Marston, J. Acoust. Soc. Am. 67, 15–26 (1980)]. Recently this method of driving oscillations has been demonstrated by employing a novel ultrasonic levitator developed at Jet Propulsion Laboratory which traps bubbles in the size range of 1- to 5-mm diameter. The quadrupole mode was observed with resonance frequencies in the range from 400 to 40 Hz. Oscillations were detected with the unaided eye and with television and laser light scattering methods. These experiments suggest methods for investigating the nonlinear dynamics of bubbles, effects of surfactants, and the dynamics of bubbles in low gravity. Some comparisons with the dynamics of drops will be noted. [Research supported by ONR and NASA.]
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