Strong interaction between a buoyancy bubble and a free surface

Wang, Qianxi; Yeo, K. S.; Khoo, Boo Cheong; Lam, K.Y.

doi:10.1007/bf00312403

Cited by 159 publications

(67 citation statements)

References 13 publications

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“…In Singapore, an active group of people is involved in bubble dynamics studies, which essentially started as a spin-off from underwater explosion-related work [40] in which the prediction of jets in collapsing bubbles is essential. Klaseboer et al [41,42] attempted to simulate the bubbleshock wave interaction using the boundary element method (BEM), where only the surface of the bubble is meshed as an alternative to the above-mentioned numerical methods.…”

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confidence: 99%

Bubbles with shock waves and ultrasound: a review

2015

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The study of the interaction of bubbles with shock waves and ultrasound is sometimes termed ‘acoustic cavitation'. It is of importance in many biomedical applications where sound waves are applied. The use of shock waves and ultrasound in medical treatments is appealing because of their non-invasiveness. In this review, we present a variety of acoustics–bubble interactions, with a focus on shock wave–bubble interaction and bubble cloud phenomena. The dynamics of a single spherically oscillating bubble is rather well understood. However, when there is a nearby surface, the bubble often collapses non-spherically with a high-speed jet. The direction of the jet depends on the ‘resistance' of the boundary: the bubble jets towards a rigid boundary, splits up near an elastic boundary, and jets away from a free surface. The presence of a shock wave complicates the bubble dynamics further. We shall discuss both experimental studies using high-speed photography and numerical simulations involving shock wave–bubble interaction. In biomedical applications, instead of a single bubble, often clouds of bubbles appear (consisting of many individual bubbles). The dynamics of such a bubble cloud is even more complex. We shall show some of the phenomena observed in a high-intensity focused ultrasound (HIFU) field. The nonlinear nature of the sound field and the complex inter-bubble interaction in a cloud present challenges to a comprehensive understanding of the physics of the bubble cloud in HIFU. We conclude the article with some comments on the challenges ahead.

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confidence: 99%

Bubbles with shock waves and ultrasound: a review

2015

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“…The jet can be directed towards this interface, if the interface is a solid boundary, Zhang et al (2001). On the other hand, if the bubble is located near a free interface, a jet directed away from the free interface can be observed, Wang et al (1996A). A bubble in a gravity field can also exhibit a jet behaviour in the collapse phase with the jet directed upwards in opposite direction to the gravity vector (pointing downwards).…”

Section: Introductionmentioning

confidence: 92%

Boundary integral equations as applied to an oscillating bubble near a fluid-fluid interface

Klaseboer

Khoo

2004

Computational Mechanics

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A new method is presented to describe the behaviour of an oscillating bubble near a fluid-fluid interface. Such a situation can be found for example in underwater explosions (near muddy bottoms) or in bubbles generated near two (biological) fluids separated by a membrane. The Laplace equation is assumed to be valid in both fluids. The fluids can have different density ratios. A relationship between the two velocity potentials just above and below the fluid-fluid interface can be used to update the co-ordinates of the new interface at the next time step. The boundary integral method is then used for both fluids. With the resulting equations the normal velocities on the interface and the bubble are obtained. Depending on initial distances of the bubble from the fluid-fluid interface and density ratios, the bubbles can develop jets towards or away from this interface. Gravity can be important for bubbles with larger dimensions.

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“…The BIM based on the potential flow theory is grid-free in the flow domain and has been widely used in bubble boundary interactions for axisymmetric cases [20][21][22][23][24][25][26][27][28][29] and for three-dimensional configurations [30 -33]. Recently, Wang et al [34 -37] developed the BIM for bubble dynamics in a compressible liquid.…”

Section: Computational Bubble Dynamicsmentioning

confidence: 99%

Cell mechanics in biomedical cavitation

2015

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Studies on the deformation behaviours of cellular entities, such as coated microbubbles and liposomes subject to a cavitation flow, become increasingly important for the advancement of ultrasonic imaging and drug delivery. Numerical simulations for bubble dynamics of ultrasound contrast agents based on the boundary integral method are presented in this work. The effects of the encapsulating shell are estimated by adapting Hoff's model used for thin-shell contrast agents. The viscosity effects are estimated by including the normal viscous stress in the boundary condition. In parallel, mechanical models of cell membranes and liposomes as well as state-of-the-art techniques for quantitative measurement of viscoelasticity for a single cell or coated microbubbles are reviewed. The future developments regarding modelling and measurement of the material properties of the cellular entities for cutting-edge biomedical applications are also discussed.

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Strong interaction between a buoyancy bubble and a free surface

Cited by 159 publications

References 13 publications

Bubbles with shock waves and ultrasound: a review

Bubbles with shock waves and ultrasound: a review

Boundary integral equations as applied to an oscillating bubble near a fluid-fluid interface

Cell mechanics in biomedical cavitation

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