Bubble dynamics in a compressible liquid. Part 2. Second-order theory

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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“…The most complete and elegant derivation of this effect is due to Lezzi and Prosperetti (1987;Prosperetti and Lezzi, 1986).…”

Section: B Extensions Of the Rayleigh-plesset Equationmentioning

confidence: 99%

Single-bubble sonoluminescence

2002

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“…A more recent evaluation of this approach can be found in Prosperetti (1986 and. Hickling and Plesset (1964) and Ivany and Hammitt (1966) used Gilmore's equation to numerically generate solutions for the collapse of a bubble that contained non-condensable gas.…”

Section: Bubble Collapsementioning

confidence: 99%

Observations of the dynamics and acoustics of travelling bubble cavitation

1991

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Individual travelling cavitation bubbles generated on two axisymmetric headforms were detected using a surface electrode probe. The growth and collapse of the bubbles were studied photographically, and these observations are related to the pressure fields and viscous flow patterns associated with each headform. Measurements of the acoustic impulse generated by the bubble collapse are analysed and found to correlate with the maximum volume of the bubble for each headform. These results are compared to the observed bubble dynamics and numerical solutions of the Rayleigh–Plesset equation. Finally, the cavitation nuclei flux was measured and predicted cavitation event rates and bubble maximum size distributions are compared with the measurements of these quantities.

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“…Extension of the equation (4) to the compressible case then is needed and has been done by several authors, see Lezzi and Prosperetti [8].…”

Section: Bubble Growth and Collapsementioning

confidence: 99%