Parametric resonance of a spherical bubble

Publisher Website
Google Scholar
Abstract
We modify a recent theory of Longuet-Higgins (1989a, b) to study the resonant interaction between an isotropic mode and one or two distort ional modes of an oscillating bubble in water when the isotropic mode is forced by ambient sound. Gravity and buoyant rise are ignored. The energy exchange between modes is strong enough so that both (or all three) can attain comparable amplitudes after a long time. We show that for two-mode interactions the mode-coupling equations are similar to those studied in other physical contexts such as nonlinear optics, coupled oscillators and standing waves in a basin. Instability around fixed points is examined for various bubble radii, phase mismatch, and detuning of the external forcing. Numerical evidences of chaotic bubble oscillations and sound radiation are discussed. It is found that in a certain parameter domain, Hopf bifurcations are possible, and chaos is reached via a period-doubling sequence. However, when there are three interacting modes, each of the two distortion modes interacts with the breathing mode directly and the route to chaos is via a quasi-periodic 2-torus. Possible relevance of this theory to the observed erratic drifting of a bubble is discussed.

This publication has 9 references indexed in Scilit: