Sonoluminescence from Stable Cavitation

Saksena, T. K.; Nyborg, Wesley L.

doi:10.1063/1.1674249

Cited by 85 publications

(36 citation statements)

References 14 publications

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“…As temperatures increase from several hundred to many thousand kelvin, those processes can be, among others, molecular recombination (Saksena and Nyborg, 1970), collision-induced emission (Frommhold and Atchley, 1994), molecular emission (Didenko et al, 2000b), excimers (Hammer and Frommhold, 2001), atomic recombination (Hilgenfeldt et al, 1999b), radiative attachment of ions (Hammer and Frommhold, 2001), neutral and ion bremsstrahlung Xu et al, 1998;Hilgenfeldt et al, 1999b), or emission from confined electrons in voids (Bernstein and Zakin, 1995). The uncertainty about the precise temperatures of SBSL bubbles (see Sec.…”

Section: B Sbsl: a Multitude Of Theoriesmentioning

confidence: 99%

“…Noltingk and Neppiras (1950) were the first to use Rayleigh-Plesset bubble dynamics to deduce bubble internal temperatures as high as 10 000 K at collapse of a spherically symmetric bubble. Within the hot spot models, which process of light emission will dominate depends on the actual maximum temperatures reached, e.g., recombination of dissociated molecules at lower temperatures (Saksena and Nyborg, 1970), or characteristic molecular radiation due to electronic excitation, in particular of the OH radical (Sehgal et al, 1980). The latter was referred to as chemiluminescence by Suslick (1990) and must not be confused with secondary chemiluminescence, which may occur in the liquid as a result of chemical reactions of the radical molecules generated in the bubble collapse.…”

Section: A Theories Of Mbsl: Discharge Vs Hot Spot Theoriesmentioning

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: B Sbsl: a Multitude Of Theoriesmentioning

confidence: 99%

Section: A Theories Of Mbsl: Discharge Vs Hot Spot Theoriesmentioning

confidence: 99%

Single-bubble sonoluminescence

2002

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“…In aqueous solution there is evidence (8)(9)(10)(11)) that the lifetime of chemically active radicals produced by sonolysis is larger than the lifetime of the cavitation bubble and so these chemically active species which are formed in the vapour phase of the cavity (the temperature of a hot gas bubble will be greater than 2000 K) migrate and are available to trigger chemical reactions. It has also been shown (1,(12)(13)(14) that the presence of certain gases can alter the secondary reaction of these radicals.…”

Section: Introductionmentioning

confidence: 99%

The effect of ultrasound on water in the presence of dissolved gases

Mead¹,

Sutherland²,

Verrall³

1976

Can. J. Chem.

149

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Sonolysis of water at 447 kHz causes a decrease in the pH. The products formed depend to some extent on the nature of the dissolved gases; products observed are hydrogen peroxide, nitrous and nitric acid. The yield of hydrogen peroxide follows the order O2 > air > Ar > N2. In the case of total acid (nitrous and nitric) the yield follows the order air >N2 > Ar > O2. Nitrogen fixation occurs in the presence of Ar and O2 because of the presence of small amounts of N2 either as an impurity in the dissolved gases, or as residual air in the incompletely degassed water.An attempt was made by using the Fricke dosimeter to obtain information on the relative chemical activity of cavitation.

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“…The basic contribution to the chemiluminescence, stimulated by the ultrasonic excitation, is made by the following processes [23]:…”

Section: Introductionmentioning

confidence: 99%

Self-oscillating Water Chemiluminescence Modes and Reactive Oxygen Species Generation Induced by Laser Irradiation; Effect of the Exclusion Zone Created by Nafion

Gudkov

Astashev

Брусков

et al. 2014

Entropy

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Samples of water inside and outside an exclusion zone (EZ), created by Nafion swollen in water, were irradiated at the wavelength l = 1264 nm, which stimulates the electronic transition of dissolved oxygen from the triplet state to the excited singlet state. This irradiation induces, after a long latent period, chemiluminescence self-oscillations in the visible and near UV spectral range, which last many hours. It occurs that this effect is EZ-specific: the chemiluminescence intensity is twice lower than that from the bulk water, while the latent period is longer for the EZ. Laser irradiation causes accumulation of H2O2, which is also EZ-specific: its concentration inside the EZ is less than that in the bulk water. These phenomena can be interpreted in terms of a model of decreasing O2 content in the EZ due to increased chemical activity of bisulfite anions (HSO3−), arisen as the result of dissociation of terminal sulfonate groups of the Nafion. The wavelet transform analysis of the chemiluminescence intensity from the EZ and the bulk water gives, that self-oscillations regimes occurring in the liquid after the latent period are the determinate processes. It occurred that the chemiluminescence dynamics in case of EZ is characterized by a single-frequency self-oscillating regime, whereas in case of the bulk water, the self-oscillation spectrum consists of three spectral bands.

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Sonoluminescence from Stable Cavitation

Cited by 85 publications

References 14 publications

Single-bubble sonoluminescence

Single-bubble sonoluminescence

The effect of ultrasound on water in the presence of dissolved gases

Self-oscillating Water Chemiluminescence Modes and Reactive Oxygen Species Generation Induced by Laser Irradiation; Effect of the Exclusion Zone Created by Nafion

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