Influences of pressure amplitudes and frequencies of dual-frequency acoustic excitation on the mass transfer across interfaces of gas bubbles

In the present paper, the influence of pressure amplitudes and frequencies of dual-frequency acoustic excitation on the mass transfer across interfaces of gas bubbles are numerically investigated. The size of bubble growth region is proposed as a criterion for the optimization of the dual-frequency approach. Our simulation reveals that a. there exists a particular point at which the threshold of mass transfer is independent of the power allocation between two sonic waves; b. for the promotion of the effects of mass transfer, more energies should be allocated to the low-frequency sonic wave rather than the high-frequency sonic wave; and c. the benefits of dual-frequency approaches decrease with the increase of the frequency ratio of the two sonic waves.