Abstract
Acoustic cavitation occurs in ultrasonic treatment causing various phenomena such as chemical synthesis, chemical decomposition and emulsification. Nonlinear oscillations of cavitation bubble are assumed to be responsible for these phenomena. Therefore, bubble oscillations have been studied especially focusing on single bubble system while those in multi-bubble systems have not been analyzed yet despite their importance for the actual ultrasonic processing. In the present study, we numerically investigated the dynamic behavior of cavitation bubbles in multi-bubble systems. The results reveal that the oscillation amplitude of bubbles becomes larger in multi-bubble environment compared with that in the single-bubble case. It is found that this is caused by an acoustic wake effect, which reduces the pressure near a bubble surrounded by other bubbles and increases the time delay between the bubble contraction/expansion cycles and sound pressure oscillations. A new parameter, called “cover ratio” is introduced to quantitatively evaluate the variation in the bubble oscillation amplitude and time delay.
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