Dynamics of cavitation bubbles in acoustic field near the rigid wall

Abstract

Dynamics of multiple cavitation bubbles near the rigid wall subjected to the incident acoustic wave with different arrangements is researched in this paper. Wave equation is used to approximate the prophase and anaphase motion of cavitation bubble to consider the compressibility of fluid. The modified Bernoulli equation is deduced as the boundary condition for cavitation bubble in acoustic field. Influences of compressibility, acoustic wave frequency and amplitude, incident angle, and the bubble arrangements on the dynamics of cavitation bubbles are presented. Numerical results show that the compressibility of fluid will impact the intensity of motion. The dynamics of bubbles is affected by the incident amplitude and frequency, and limited by the rigid wall. The different incident angles and arrangements of bubbles will change the acting pressure phase and interaction between bubbles and rigid wall, which will lead to the motion advancement or delay. The radius difference will increase with the large phase difference and the strong rejection. The jet will be oblique to the incident direction, as well as the rigid wall and bubbles around.