벽 근처에서 안티버블 거동에 관한 수치모사

초록

Numerical study is conducted for the acoustically-driven oscillation of an antibubble, which is a composite of droplet core and surrounding bubble. The interfaces between the droplet, bubble and surrounding liquid regions are calculated by two level-set functions. The conservation equations in the three regions are solved by using the ghost-fluid method to treat the interface conditions and the semi-implicit pressure correction method to consider the bubble compressibility effect. The numerical results for antibubble oscillation compare well with the theoretical predictions when the antibubble is far from the wall. The presence of wall inhibits the antibubble oscillation and reduces its resonance frequency. The effects of wall, acoustic amplitude and droplet-bubble volume ratio on the antibubble oscillation are investigated.

키워드