抄録
Numerical simulations of bubble pulsations have been performed in order to study the experimentally observed bubble motion under an ultrasonic horn by high-speed video camera. The comparison between the calculated results and the experimental observation of the bubble pulsation has indicated that the bubble pulsation is strongly influenced by surrounding bubbles which change the velocity field in the liquid by their pulsations. The expansion of a bubble during the rarefaction phase of ultrasound is strongly reduced by the interaction with surrounding bubbles. Some bubbles move toward the horn tip due to the secondary Bjerkens force acting from the bubbles near the horn tip. It has also been shown that the acoustic amplitude in the liquid is strongly reduced by cavitation due to the decrease in acoustic radiation resistance.
