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Dynamic modeling of cavitation bubble clusters:Effects of evaporation,condensation,and bubble-bubble interaction

Chinese Physics B 2024年第4期33卷 527-535页

作者：许龙姚昕锐沈阳 College of Science China Jiliang UniversityHangzhou 310018China

We present a dynamic model of cavitation bubbles in a cluster,in which the effects of evaporation,condensation,and bubble-bubble interactions are taken into *** different ultrasound conditions,we examine how the dynamics of cavitation bubbles are affected by several factors,such as the locations of the bubbles,the ambient radius,and the number of *** the variations of bubble radius,energy,temperature,pressure,and the quantity of vapor molecules are *** findings reveal that bubble-bubble interactions can restrict the expansion of bubbles,reduce the exchange of energy among vapor molecules,and diminish the maximum internal temperature and pressure when *** ambient radius of bubbles can influence the intensities of their oscillations,with clusters comprised of smaller bubbles creating optimal conditions for generating high-temperature and high-pressure ***,an increase in the number of bubbles can further inhibit cavitation *** frequency,pressure and waveform of the driving wave can also exert a significant influence on cavitation activities,with rectangular waves enhancing and triangular waves weakening the cavitation of bubbles in the *** results provide a theoretical basis for understanding the dynamics of cavitation bubbles in a bubble cluster,and the factors that affect their behaviors.

关键词： bubble dynamics bubble-bubble interaction mass exchange ultrasound waveform

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Repulsive bubble-bubble interaction in ultrasonic field

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Chinese Physics B 2021年第10期30卷 371-376页

作者： Ling-Ling Zhang Wei-Zhong Chen Yao-Rong Wu Yang Shen Guo-Ying Zhao Key Laboratory of Modern Acoustics(Ministry of Education) Institute of AcousticsNanjing UniversityNanjing 210093China

The bubble-bubble interaction(BBI)is attractive in most cases,but also could be *** the present study,three specific mechanisms of repulsive BBI are *** great contribution to the repulsive BBI is derived from the large radius of the bubble catching the rebound point of the other ***“elastic”bubble and“inelastic”bubble,with the increase of the phase shift between two bubbles,the BBI changes from attractive to repulsive,and the repulsion can be *** both“elastic”bubbles,the BBI alternates between attractive interaction and repulsive interaction along the direction where the ambient radius of one of bubbles *** stimulating bubble and stimulated bubble,the BBI can be *** property depends on the ambient radii of *** addition,the distribution of the radiation forces in ambient radius space shows that the BBI is sensitive to the size of bubble and is complex because the bubbles are not of the same size in an ultrasonic ***,as the distance increases or decreases monotonically with time,the absolute value of the BBI decreases or increases,*** BBI can oscillate not only in strength but also in polarity when the distance fluctuates with time.

关键词： bubble-bubble interaction repulsion phase shift

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interaction between encapsulated microbubbles:A finite element modelling study

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Chinese Physics B 2018年第8期27卷 315-323页

作者： Chen-Liang Cai Jie Yul Juan Tu Xia-Sheng Guo Pin-Tong Huang Dong Zhang Key Laboratory of Modem Acoustics（MOE） Department of PhysicsCollaborative Inovation Center of Advanced Microstructure Nanjing UniversityNanjing 210093China Department of Ultrasound the Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310009China The State Key Laboratory of Acoustics Chinese Academy of SciencesBeijing 100190China

Theoretical studies on the multi-bubble interaction are crucial for the in-depth understanding of the mechanism behind the applications of ultrasound contrast agents （UCAs） in clinics. A two-dimensional （2D） axisymmetric finite element model （FEM） is developed here to investigate the bubble-bubble interactions for UCAs in a fluidic environment. The effect of the driving frequency and the bubble size on the bubble interaction tendency （viz., bubbles＇ attraction and repulsion）, as well as the influences of bubble shell mechanical parameters （viz., surface tension coefficient and viscosity coefficient） are discussed. Based on FEM simulations, the temporal evolution of the bubbles＇ radii, the bubble-bubble distance, and the distribution of the velocity field in the surrounding fluid are investigated in detail. The results suggest that for the interacting bubble-bubble couple, the overall translational tendency should be determined by the relationship between the driving frequency and their resonance frequencies. When the driving frequency falls between the resonance frequencies of two bubbles with different sizes, they will repel each other, otherwise they will attract each other. For constant acoustic driving parameters used in this paper, the changing rate of the bubble radius decreases as the viscosity coefficient increases, and increases first then decreases as the bubble shell surface tension coefficient increases, which means that the strength of bubble-bubble interaction could be adjusted by changing the bubble shell visco-elasticity coefficients. The current work should provide a powerful explanation for the accumulation observations in an experiment, and provide a fundamental theoretical support for the applications of UCAs in clinics.

关键词： ultrasound contrast agent microbubbles bubble-bubble interaction finite element model shellparameter

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