Behaviour of a cloud of bubbles filled with vapour and a small amount of noncondensable gas (A theoretical and numerical study)

Klaseboer, Evert; Bruin, G.J. de

doi:10.1051/lhb/1992055

Cited by 2 publications

(3 citation statements)

References 6 publications

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“…The dynamics of these bubble clouds is a major challenge from a modelling point of view [58]. The sound field is nonlinear (i.e.…”

Section: Bubble Clouds Streamers and Cometsmentioning

confidence: 99%

“…At high driving voltage, a HIFU transducer in water produces a high pressure at its focal point which in turn generates bubble clouds. The dynamics of these bubble clouds is a major challenge from a modelling point of view [58]. The sound field is nonlinear (i.e.…”

Section: Bubble Clouds Streamers and Cometsmentioning

confidence: 99%

“…There are limitations to this model, for instance the bubble cloud is spherical and interactions between the bubbles are not considered. Subsequently more complex models were developed (for example for vapour bubbles [58]). Doinikov [68] showed a Lagrangian formalism model which is capable of modelling the radial and translational motion of a bubble in a three-dimensional cluster in an ultrasound field.…”

Section: Bubble Clouds Streamers and Cometsmentioning

confidence: 99%

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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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“…The dynamics of these bubble clouds is a major challenge from a modelling point of view [58]. The sound field is nonlinear (i.e.…”

Section: Bubble Clouds Streamers and Cometsmentioning

confidence: 99%

Section: Bubble Clouds Streamers and Cometsmentioning

confidence: 99%

Section: Bubble Clouds Streamers and Cometsmentioning

confidence: 99%

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Bubbles with shock waves and ultrasound: a review

2015

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Blake, bubbles and boundary element methods

Ohl

Rahim

Klaseboer

et al. 2019

IMA Journal of Applied Mathematics

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Professor John Blake spent a considerable part of his scientific career on studying bubble dynamics and acoustic cavitation. As Blake was a mathematician, we will be focusing on the theoretical and numerical studies (and much less on experimental results). Rather than repeating what is essentially already known, we will try to present the results from a different perspective as much as possible. This review will also be of interest for readers who wish to know more about the boundary element method in general, which is a method often used by Blake and his colleagues to simulate bubbles. We will, however, not limit the discussion to bubble dynamics but try to give a broad discussion on recent advances and improvements to this method, especially for potential problems (Laplace) and wave equations (Helmholtz). Based on examples from Blake’s work, we will guide the reader and show some of the mysteries of bubble dynamics, such as why jets form in collapsing bubbles near rigid surfaces. Where appropriate, we will illustrate the concepts with examples drawn from numerical simulations and experiments.

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Behaviour of a cloud of bubbles filled with vapour and a small amount of noncondensable gas (A theoretical and numerical study)

Abstract: NomenclatureArticle published by SHF and available at

Cited by 2 publications

References 6 publications

Bubbles with shock waves and ultrasound: a review

Bubbles with shock waves and ultrasound: a review

Blake, bubbles and boundary element methods

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