Noble Gas Influence on Temperature of Pulsating Micro-Bubble

Single micro-bubble sonoluminescence occurs when an acoustically trapped and periodically pulsating micro-bubble collapses so strongly that the energy focusing at collapse leads to light emission. A lot of research efforts devoted to sonoluminescence (SL) are in the continuum limit. Recently, there has been rise in molecular dynamic trend in investigating this phenomenon due to failure of conventional methods in describing the whole SL process. Conventional works report strong relation between the presence of noble gases in the micro-bubble and its behavior, e.g. bubble temperature. In this work, Direct Simulation Monte Carlo method (DSMC) is utilized to study the dependence of temperature of micro-bubble on the noble gas content of microbubble while the effect of water vapor is neglected. Internal behavior of Sonoluminescing single micro-bubble filled with noble gas is modeled as a rigid sphere driven by a supersonic collapsing piston. The temperature of micro-bubble increases when noble gas with heavier molecular mass is used. This finding at molecular dynamic level is in concord with the results obtained by their hydrodynamics counterparts.