Inertial cavitation and single–bubble sonoluminescence

Matula, Thomas J.

doi:10.1098/rsta.1999.0325

Cited by 106 publications

(69 citation statements)

References 35 publications

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“…However, the theoretical prediction seems too small by a factor of about 10. Matula (1999) gives evidence that the discrepancy could be connected with the back reaction of the bubble on the sound field. Note that both the acoustic and the buoyancy forces are fluctuating over one period, leading to small fluctuations of the equilibrium position as well.…”

Section: G Bjerknes Forcesmentioning

confidence: 99%

“…As pointed out by Cordry (1995), Akhatov et al (1997), Matula et al (1997), andMatula (1999), for very large forcing pressure, F Bj can become repulsive, driving the bubble away from the center of the flask, rendering SBSL impossible. The calculations of Akhatov et al (1997), Matula et al (1997), and Matula (1999) demonstrate that this Bjerknes instability occurs above pressure amplitudes of P a Ϸ1.8 bars, already above the upper threshold where single-bubble sonoluminescence usually occurs. Current experimental data appear to indicate that shape instabilities limit the upper threshold of sonoluminescence, which is discussed in detail below.…”

Section: G Bjerknes Forcesmentioning

confidence: 99%

“…Parametric instabilities can be inferred from the occurrence of large scattering spikes (near 9 and 10.5 s in this figure), a consequence of the strong shape distortions of the bubble. Direct imaging of the bubble (Matula, 1999) shows nonspherical bubble shapes. From Matula (1999).…”

Section: Afterbounce Instabilitymentioning

confidence: 99%

“…36 (theory) and Fig. 37 (experiment), the latter taken from Matula (1999). The distortion can grow so much that the bubble breaks apart during the afterbounce period.…”

Section: Fig 35 Comparison Of Boundary Layer Approximation and Fullmentioning

confidence: 99%

“…The thin curve shows the driving pressure P(t). From Matula (1999). as well as evaporation/condensation of water vapor (see Sec. III), and the (local) driving pressure P a is very sensitive to perturbations of the flask geometry, such as might be caused by a small hydrophone attempting to measure P a .…”

Section: E Comparison To Experimentsmentioning

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: G Bjerknes Forcesmentioning

confidence: 99%

Section: G Bjerknes Forcesmentioning

confidence: 99%

Section: Afterbounce Instabilitymentioning

confidence: 99%

“…36 (theory) and Fig. 37 (experiment), the latter taken from Matula (1999). The distortion can grow so much that the bubble breaks apart during the afterbounce period.…”

Section: Fig 35 Comparison Of Boundary Layer Approximation and Fullmentioning

confidence: 99%

Section: E Comparison To Experimentsmentioning

confidence: 99%

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Single-bubble sonoluminescence

2002

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Effect of CO₂ Bubbles on Crystallization Behavior of Anhydrous Milk Fat

Adhikari

Truong

Bansal

et al. 2020

J Americ Oil Chem Soc

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A study was designed to observe the effect of bubbles created from dissolved CO2 (0-2000 ppm) on crystallisation and melting behaviour, fat polymorphs, microstructure and hardness of anhydrous milk fat (AMF) under non-isothermal crystallisation conditions. Calculated amounts of dry ice were added to generate 2000 ppm CO2 at low partial pressure, and an ultrasound (205 kHz, 10 s; US) treatment was delivered at 35 o C through a non-contact metal transducer on the molten AMF to generate bubbles (~500 nm) of CO2. The generated CO2 bubbles was found to induce a higher onset of crystallisation temperature during cooling from 35 to 5 o C at the rate of 0.5 o C min -1 . The changes in crystallisation behaviour owing to the generation of a smaller and significant number of TAG crystals also increased the hardness of the AMF at room temperature and refrigerated conditions. The work suggested the potential use of CO2 nano-bubbles derived from the dry ice with the emission of low power US to control the crystallisation behaviour and thereby the physical properties of milk fat-containing dairy products.

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