Abstract
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 shell effect and area effect, 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 hysteresis effect, 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.
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