Nonlinear dynamics and acoustic emissions of interacting cavitation bubbles in viscoelastic tissues.
Nonlinear dynamics and acoustic emissions of interacting cavitation bubbles in viscoelastic tissues.
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DOI：
10.1016/j.ultsonch.2021.105712
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发表时间：
2021-10
影响因子：
8.4
通讯作者：
Li Z
中科院分区：
文献类型：
--
作者：
Qin D;Zou Q;Lei S;Wang W;Li Z
The radial and translational motions of two interacting bubbles are studied. Bubble dynamics is analyzed by bifurcation structures and acoustic emission spectra. Small bubble is remarkably suppressed, while large bubble is slightly enlarged. Bubble−bubble interaction reduces the nonlinear dynamics and acoustic emissions. Viscoelasticity of the medium reduces the radial and translational bubble motions. The cavitation-mediated bioeffects are primarily associated with the dynamic behaviors of bubbles in viscoelastic tissues, which involves complex interactions of cavitation bubbles with surrounding bubbles and tissues. The radial and translational motions, as well as the resultant acoustic emissions of two interacting cavitation bubbles in viscoelastic tissues were numerically investigated. Due to the bubble–bubble interactions, a remarkable suppression effect on the small bubble, whereas a slight enhancement effect on the large one were observed within the acoustic exposure parameters and the initial radii of the bubbles examined in this paper. Moreover, as the initial distance between bubbles increases, the strong suppression effect is reduced gradually and it could effectively enhance the nonlinear dynamics of bubbles, exactly as the bifurcation diagrams exhibit a similar mode of successive period doubling to chaos. Correspondingly, the resultant acoustic emissions present a progressive evolution of harmonics, subharmonics, ultraharmonics and broadband components in the frequency spectra. In addition, with the elasticity and/or viscosity of the surrounding medium increasing, both the nonlinear dynamics and translational motions of bubbles were reduced prominently. This study provides a comprehensive insight into the nonlinear behaviors and acoustic emissions of two interacting cavitation bubbles in viscoelastic media, it may contribute to optimizing and monitoring the cavitation-mediated biomedical applications.
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