Thermal effects on nonlinear radial oscillations of gas bubbles in liquids under acoustic excitation

Modeling of nonlinear radial oscillations of gas bubbles in liquids under acoustic excitation is an important subject for understanding of many acoustic bubble related phenomena (e.g., sonoluminescence, sonochemistry and sonoporation). In the present paper, numerical simulations of the oscillations of gas bubbles in liquids based on a more complete polytropic model are performed with heat transfer across bubble interfaces considered. By comparing with predictions given in the literature that using a constant polytropic exponent and ignoring energy dissipation through a heat transfer across bubble interfaces, our simulations reveal that the polytropic exponent and thermal dissipation mechanism significantly influence the predictions of nonlinear bubble behavior (e.g., locations and magnitudes of resonances, thresholds of subharmonics and ultraharmonics).