Mass transfer of acoustic cavitation bubble is numerically investigated focusing on ultrasonic frequency. In the present simulation, transport of chemical specie from an acoustic cavitation bubble after rapid bubble compression is modeled. The simulation results indicate that the bubble oscillation is more nonlinear, and the oscillation amplitude becomes larger with sound pressure amplitude, ultrasonic frequency, and bubble size. Under the condition of strong nonlinear bubble oscillations, the bubble shape becomes non-spherical. The mass transfer of chemical specie becomes smaller with sound pressure amplitude at 20 kHz ultrasound due to and , although it becomes larger with pressure amplitude at higher ultrasonic frequency because the concentration of chemical specie in the bubble becomes high near the periphery of bubble due to , which becomes remarkable especially at higher ultrasonic frequency because time for the bubble compression becomes too short for chemical specie to diffuse at higher ultrasonic frequency.

中文翻译：

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超声频率对声空化泡传质的影响


以超声波频率为中心，对声空化气泡的质量传递进行了数值研究。在本模拟中，对快速气泡压缩后声空化气泡中化学物质的传输进行了建模。仿真结果表明，气泡振荡更加非线性，振荡幅度随着声压幅值、超声频率和气泡尺寸的增大而变大。在强烈的非线性气泡振荡的情况下，气泡形状变得非球形。由于 和 ，化学物质的传质随着 20 kHz 超声波下的声压振幅而变小，尽管在较高超声波频率下化学物质的传质随着压力振幅而变大，因为气泡中化学物质的浓度在气泡周边附近变高，因为 ，这在较高的超声波频率下变得尤其显着，因为气泡压缩的时间对于化学物质在较高的超声波频率下扩散来说变得太短。