Instability of sonoluminescing bubbles under a nonspherical symmetrical acoustic-pressure perturbation.
The perturbation of nonspherical symmetrical acoustic pressure is added to the equation governing the spherical stability of sonoluminescing bubbles. The numerical calculations of the shape instability of sonoluminescing bubbles with the modified equation are conducted and the results are illustrated accordingly in the p(a) - R0 phase diagrams. The calculated results indicate that the stability region vanishes as the amplitude of the driving acoustic pressure p(a) arrives at the upper threshold ( approximately 1.6 atm) due to the perturbation of a small nonspherical symmetrical acoustic pressure (about a few Pa), which is in consistence with the experimental observations.
An
Yu
Y
Department of Physics, Tsinghua University, Beijing 100084, China.
Lu
Tao
T
Yang
Bing
B