Collapsing cavities, toroidal bubbles and jet impact

Blake, J. R.; Hooton, Martin; Robinson, P. B.; Tong, R. P.

doi:10.1098/rsta.1997.0023

Cited by 114 publications

(78 citation statements)

References 23 publications

(18 reference statements)

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“…Consequently, they operated on a time scale that was restricted to the early periods of the cavitation event, before these effects became important [43][44][45]. The advantage of the freeLagrange technique developed for this project [14,15,21] is that it can capture all these aspects, and follow the collapse through to the formation of the blast wave (which dominates the far-field emission from such a cavitation) and beyond.…”

Section: (B) the Kirchhoff Acoustic Emission Schemementioning

confidence: 99%

Prediction of far-field acoustic emissions from cavitation clouds during shock wave lithotripsy for development of a clinical device

et al. 2013

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This study presents the key simulation and decision stage of a multi-disciplinary project to develop a hospital device for monitoring the effectiveness of kidney stone fragmentation by shock wave lithotripsy (SWL). The device analyses, in real time, the pressure fields detected by sensors placed on the patient's torso, fields generated by the interaction of the incident shock wave, cavitation, kidney stone and soft tissue. Earlier free-Lagrange simulations of those interactions were restricted (by limited computational resources) to computational domains within a few centimetres of the stone. Later studies estimated the far-field pressures generated when those interactions involved only single bubbles. This study extends the free-Lagrange method to quantify the bubblebubble interaction as a function of their separation. This, in turn, allowed identification of the validity of using a model of non-interacting bubbles to obtain estimations of the far-field pressures from 1000 bubbles distributed within the focus of the SWL field. Up to this point in the multi-disciplinary project, the design of the clinical device had been led by the simulations. This study records the decision point when the project's direction had to be led by far more costly clinical trials instead of the relatively inexpensive simulations.

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Section: (B) the Kirchhoff Acoustic Emission Schemementioning

confidence: 99%

Prediction of far-field acoustic emissions from cavitation clouds during shock wave lithotripsy for development of a clinical device

et al. 2013

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“…Ever since Lord Rayleigh's (1917) first study of cavitation was motivated by the study of cavitation damage on ship propellers, this has been a major driving force behind research on bubbles. A large industry is thus concerned with avoiding violent bubble collapses that can do damage by shear as well as with the shock waves they emit, or the thin, fast liquid jets ejected from asymmetrically collapsing bubbles (Blake et al, 1997;Ohl et al, 1998). Even when the forces are not too large, cavitation can simply disrupt laminar fluid flow, with serious consequences for applications such as fuel transport through valves and tubes or inkjet printing (Dijksman, 1999).…”

Section: Other Applications Of Bubble Dynamics and Cavitationmentioning

confidence: 99%

Single-bubble sonoluminescence

2002

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Single-bubble sonoluminescence occurs when an acoustically trapped and periodically driven gas bubble collapses so strongly that the energy focusing at collapse leads to light emission. Detailed experiments have demonstrated the unique properties of this system: the spectrum of the emitted light tends to peak in the ultraviolet and depends strongly on the type of gas dissolved in the liquid; small amounts of trace noble gases or other impurities can dramatically change the amount of light emission, which is also affected by small changes in other operating parameters (mainly forcing pressure, dissolved gas concentration, and liquid temperature). This article reviews experimental and theoretical efforts to understand this phenomenon. The currently available information favors a description of sonoluminescence caused by adiabatic heating of the bubble at collapse, leading to partial ionization of the gas inside the bubble and to thermal emission such as bremsstrahlung. After a brief historical review, the authors survey the major areas of research: Section II describes the classical theory of bubble dynamics, as developed by Rayleigh, Plesset, Prosperetti, and others, while Sec. III describes research on the gas dynamics inside the bubble. Shock waves inside the bubble do not seem to play a prominent role in the process. Section IV discusses the hydrodynamic and chemical stability of the bubble. Stable single-bubble sonoluminescence requires that the bubble be shape stable and diffusively stable, and, together with an energy focusing condition, this fixes the parameter space where light emission occurs. Section V describes experiments and models addressing the origin of the light emission. The final section presents an overview of what is known, and outlines some directions for future research. CONTENTS

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“…Free-surface thin jets of inviscid fluids occur in many different areas of fluid dynamics (Eggers 1997), including surface waves (Longuet-Higgins 1976, 1983Longuet-Higgins & Dommermuth 2001), asymmetric bubble collapse (Blake et al 1997;Prosperetti 1997;, bursting of bubbles at a free surface (Duchemin et al 2002), drop impact onto a solid surface (Bartolo et al 2006) or even ink-jet printing (Dijksman 1999). Fundamental instabilities involving jets have been widely studied, among which are the Rayleigh-Taylor (RT;Rayleigh 1900;Taylor 1950) and Richtmyer-Meshkov (RM) instabilities (Richtmyer 1960;Meshkov 1969).…”

Section: Introductionmentioning

confidence: 99%

Self-focusing of thin liquid jets

Duchemin

2007

Proc. R. Soc. A.

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The nonlinear evolution of an initially perturbed free surface perpendicularly accelerated, or of an initially flat free surface subject to a perturbed velocity profile, gives rise to the emergence of thin spikes of fluid. We are investigating the long-time evolution of a thin inviscid jet of this kind, subject or not to a body force acting in the direction of the jet itself. A fully nonlinear theory for the long-time evolution of the jet is given. In two dimensions, the curvature of the tip scales like t 3 , where t is time, and the peak undergoes an overshoot in acceleration which evolves like t K5 . In three dimensions, the jet evolves towards an axisymmetric shape, and the curvature and the overshoot in acceleration obey asymptotic laws in t 2 and t K4 , respectively. The asymptotic selfsimilar shape of the spike is found to be a hyperbola in two dimensions, a hyperboloid in three dimensions. Scaling laws and self-similarity are confronted with two-dimensional computations of the Richtmyer-Meshkov instability.

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Collapsing cavities, toroidal bubbles and jet impact

Cited by 114 publications

References 23 publications

Prediction of far-field acoustic emissions from cavitation clouds during shock wave lithotripsy for development of a clinical device

Prediction of far-field acoustic emissions from cavitation clouds during shock wave lithotripsy for development of a clinical device

Single-bubble sonoluminescence

Self-focusing of thin liquid jets

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