Shock Wave Emissions of a Sonoluminescing Bubble

Holzfuss, Joachim; Rüggeberg, Matthias; Billo, Andreas

doi:10.1103/physrevlett.81.5434

Cited by 149 publications

(85 citation statements)

References 26 publications

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“…that the shock velocity in the immediate vicinity of the bubble is as fast as 4000 m/s, much faster than the speed of sound cϭ1430 m/s in water under normal conditions, but in good agreement with the results of Holzfuss, Rü ggeberg, and Billo (1998). This high shock speed originates from the strong compression of the fluid around the bubble at collapse.…”

Section: F Sound Emission From the Bubblesupporting

confidence: 77%

“…This has been detected by Cordry (1995), Holzfuss, Rü ggeberg, and Billo (1998), , Wang et al (1999), Gompf and Pecha (2000), Pecha and Gompf (2000), and Weninger et al (2000). used a piezoelectric hydrophone to measure a pressure pulse with fast rise time (5.2 ns) and high amplitude (1.7 bars) at a transducer at 1-mm distance from the bubble.…”

Section: F Sound Emission From the Bubblementioning

confidence: 99%

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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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Section: F Sound Emission From the Bubblesupporting

confidence: 77%

Section: F Sound Emission From the Bubblementioning

confidence: 99%

Single-bubble sonoluminescence

2002

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“…In the late stages of the collapse the interface velocity can be even higher than the speed of sound in the liquid which results in an outgoing shock wave in the water [30][31][32]. The main collapse is followed by a sequence of afterbounces with decreasing amplitude, after which the whole process repeats itself in the next acoustic cycle.…”

Section: Stability and Chaosmentioning

confidence: 99%

Periodic orbit theory applied to a chaotically oscillating gas bubble in water

Simon

Cvitanović

Levinsen³

et al. 2001

Nonlinearity

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This study investigates the dynamics of an acoustically driven air bubble in water. Depending on the values of external parameters, the radial oscillations of the bubble can be either stable or chaotic. The necessary condition of chaotic behaviour is identified to be the non-zero amplitude of the bubble's afterbounces at the beginning of the next acoustic cycle, which brings memory into the system. We show that for some parameter values in the chaotic regime the dynamics can be reduced to a unimodal map. At these parameter values the periodic orbit theory is successfully applied to calculate averages of relevant physical quantities, such as the air concentration at which the bubble is in diffusive equilibrium with the surrounding liquid. Finally we investigate the convergence of the calculated quantities.

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“…Apparently, the area affected by the shock wave is clearly reflected by the radius of mist layer which is~1/3 larger than original bubble radius (radius of the bright area). By applying the simulated pressure amplitude, that is, 0.5 MPa at the bubble position, into Gilmore model, the corresponding abrupt changes of the bubble radius and velocity at the bubble wall are 3046 bar* [15] Empirical constant (n) 7.025* [15] *Due to lack of data, the speeds of sound in pure Bi and Sn were assumed for Bi-8 wt pct Zn and Sn-13 wt pct Bi, respectively. The values of empirical constants, B and n, for water were used.…”

Section: Applying Ultrasonic Waves Inside Liquid Mediamentioning

confidence: 99%

In Situ Synchrotron X-ray Study of Ultrasound Cavitation and Its Effect on Solidification Microstructures

Tan

Lee

2014

Metall Mater Trans B

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Considerable progress has been made in studying the mechanism and effectiveness of using ultrasound waves to manipulate the solidification microstructures of metallic alloys. However, uncertainties remain in both the underlying physics of how microstructures evolve under ultrasonic waves, and the best technological approach to control the final microstructures and properties. We used the ultrafast synchrotron X-ray phase contrast imaging facility housed at the Advanced Photon Source, Argonne National Laboratory, US to study in situ the highly transient and dynamic interactions between the liquid metal and ultrasonic waves/bubbles. The dynamics of ultrasonic bubbles in liquid metal and their interactions with the solidifying phases in a transparent alloy were captured in situ. The experiments were complemented by the simulations of the acoustic pressure field, the pulsing of the bubbles, and the associated forces acting onto the solidifying dendrites. The study provides more quantitative understanding on how ultrasonic waves/bubbles influence the growth of dendritic grains and promote the grain multiplication effect for grain refinement. have been widely used in industry, e.g., in ultrasonic cleaning, sonochemistry, and medical treatment. In the past few decades, extensive laboratory results have demonstrated that applying ultrasound waves into solidifying liquid alloys can lead to the refinement of alloy microstructures. [1][2][3] Although ultrasound-induced grain refinement has been shown effective in many metallic alloy systems, almost all previous research have interpreted the mechanism of grain refinement based on post-mortem microstructural characterization of the solidified alloys and empirical correlation, if any, between the measured grain size and the input ultrasonic power. [4,5] A very recent high-speed imaging study of ultrasonic treatment of a solidifying organic transparent alloy revealed that the shock wave emitted from imploding bubbles can fracture the growing dendrites, [6] increasing the grain multiplication effect that leads to the enhancement of grain refinement. However, in situ and real time studies of the fundamentals of how the highly dynamic ultrasonic waves and the ultrasonic bubbles interact with the liquid metal, the semisolid and solid phases nucleated during solidification have not been reported mainly due to the difficulties in studying the bubble dynamics in the opaque liquid metal. In this paper, we report a number of in situ imaging studies of the dynamic behavior of ultrasonic bubbles in a Sn-13 wt pct Bi and a Bi-8 wt pct Zn alloy using the ultrafast X-ray phase contrast imaging (PCI) facility housed at the Advanced Photon Source (APS), Argonne National Laboratory, US. The real-time imaging studies are complemented by a numerical simulation of the bubble dynamics using the classical Gilmore model. [7] The experiments were carried out at the beamline 32-ID-B of APS, and the detailed description of the experiment can be found in References 8, 9. The undulator gap was set to 14 ...

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Shock Wave Emissions of a Sonoluminescing Bubble

Cited by 149 publications

References 26 publications

Single-bubble sonoluminescence

Single-bubble sonoluminescence

Periodic orbit theory applied to a chaotically oscillating gas bubble in water

In Situ Synchrotron X-ray Study of Ultrasound Cavitation and Its Effect on Solidification Microstructures

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