In this paper,the coupling effect and interaction force between double bubbles in acoustic-induced cavita-tion are studied.Based on the basic theory of bubble dynamics,the unified equation for bubble dynamics was applied to study the coupling of double bubbles in a sound field.A theoretical model was established to calculate the pulsa-tion and coupling of multiple bubbles in the sound field,and the changing trend exhibited by the secondary Bjerknes force existing between double bubbles in different sound field types was studied.The results show that in a traveling wave sound field with a small sound pressure amplitude,the interaction of the two bubbles with nonlinear pulsation is related to the parameters of the sound field and is affected by the initial volume ratio of the two bubbles.If the initial volume of one bubble is fixed and that of the other bubble is changed simultaneously,then the secondary Bjerknes force between the two bubbles in the first cycle will reach the first extreme value when their initial volumes are equal;furthermore,it will subsequently show a periodic fluctuation,increasing on the whole.However,in the traveling wave sound field with a large sound pressure amplitude,the interaction between bubbles continues to increase with the initial radius ratio,and the periodic fluctuation phenomenon is not obvious.Moreover,this phenomenon can be observed near the node in a standing wave sound field.In addition,the coupling effect of double bubbles with nonlin-ear vibration in a combined wave sound field with the same frequency and different pressure amplitudes is investiga-ted.This paper aims to provide a theoretical basis for the coupling of double bubbles in the sound field and the relat-ed application of bubble group dynamics.
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