A new formulation of bubble dynamics for sonoluminescence

Abstract

A new model of bubble dynamics is constructed in order to investigate single-bubble sonoluminescence (SBSL). In this model, the effects of non-equilibrium evaporation and condensation of water vapor at the bubble wall and of thermal conduction both inside and outside a bubble are taken into account. The most important point in the present study is in the numerical simulation of bubble oscillations that, for the first time in the studies of SBSL include the effects of non-equilibrium evaporation and condensation of water vapor at the bubble wall. The results reveal that this affects bubble dynamics considerably. For example, the vapor pressure at collapse is a few orders of magnitude larger than the saturated vapor pressure at ambient liquid temperature. The calculated results also reveal that the liquid temperature at the bubble wall increases considerably at the collapse due to thermal conduction from the heated interior of the bubble. This means that chemical reactions take place not only inside the bubble but also outside it. © 1998 Scripta Technica, Electron Comm Jpn Pt 2, 81(2): 39–45, 1998