Mechanism of cavitation bubble luminescence
Abstract
We introduced briefly the main progress in the research of single bubble sonoluminescence, and summarized our theoretical calculation research of this topic. Solving the equations of fluid mechanics, we performed the full numerical calculation. We found that the mechanism of the cavitation bubble luminescence is high temperature, high pressure and high density gas light emission. Corresponding to the temperature approached inside the bubble, sometimes atomic or molecular line emission process dominates and sometimes the continuum contributes the most. With the research of single bubble shape instability, we found that it is the perturbation of spherical asymmetry of the driving acoustic pressure results in its upper threshold.
