Sonoluminescence: how bubbles glow

Hammer, Dominik; Frommhold, Lothar

doi:10.1080/09500340117525

Cited by 44 publications

(16 citation statements)

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“…This imprecise nomenclature arose from acoustics being mainly used to generate the cavitation in the early decades (Marinesco & Trillat 1933;Jarman 1960;Knapp, Daily & Hammett 1970). The current debate on the commonality of the sources of the various luminescences calls this nomenclature into question (Barber et al 1992;Matula & Roy 1997;Blake 1999;Leighton, Cox & Phelps 2000;Hammer & Frommhold 2001).…”

Section: Introductionmentioning

confidence: 99%

Cavitation luminescence from flow over a hydrofoil in a cavitation tunnel

et al. 2003

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This paper describes a photon-counting study of the cavitation luminescence produced by flow over a hydrofoil. This has previously been identified in water saturated with xenon. The four objectives of this study are: to determine whether luminescence can be obtained using air-saturated water; to quantify this emission, if it is present, as a function of flow parameters; to determine whether the photon arrivals occur with random timing, or in ‘bursts’; to put limits on the rates associated with any bursts. The flow experiments were performed in a cavitation tunnel capable of achieving flow velocities of up to about 50 m s$^{-1}$ in the test section. The experimental hydrofoil was a NACA 009 blade. Parameters varied were the flow velocity, the incident angle of the hydrofoil and the cavitation index. The results show that significant photon counts are recorded when leading-edge cavitation takes place and U-shaped vortices (cavities) are shed from the main cavity. The photon count increases dramatically as the flow velocity increases or the cavitation index is reduced. Departures from a Poisson distribution in the arrival times of photons at the detector suggest the presence of ‘bursts’. These may be related to the way vortices are shed from the main cavity. Limits are inferred on the detection rates associated with bursts.

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Section: Introductionmentioning

confidence: 99%

Cavitation luminescence from flow over a hydrofoil in a cavitation tunnel

et al. 2003

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“…The £ value in normal ionisation translates to the gas being ~ 13.5% ionised at 10000 K and ~ 37% ionised at 20000 K. This corresponds to slightly more ionisation (and, hence, more energy involvement) at a given temperature threshold than SL research suggests [2,9]. However, other effects such as chemical reactions (which, at bubble collapse, absorb heat energy in a similar way to ionisation) have not been included in this model, so a conservative £ estimate was used to accommodate them.…”

Section: Ionisation Parameters Following the Derivation And Implementmentioning

confidence: 97%

Including ionisation in a simple model of single-bubble sonoluminescence

Munro

Forbes

2006

ANZIAM J.

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A small gas bubble in a liquid, when driven by intense ultrasound, collapses and emits light in a process called Single-Bubble Sonoluminescence (SBSL). While the dynamics of driven bubbles are well studied, less is known of the physical conditions in the gas or whether it is necessary to include ionisation in simpler studies of bubble dynamics. In this study, a model was derived from Rayleigh-Plesset dynamics, a van der Waals equation of state and the first law of thermodynamics (including interfacial heat transfer and ionisation). Stronger model ionisation reduced the maximum collapse temperature, and altered other collapse characteristics. Chaotic parameter regions are proximal to, but not coincident with, known stable SL regions. Resonant behaviour was only markedly affected by ionisation close to these chaotic regions.2000 Mathematics subject classification: 37N10, 76N99, 80A99, 65L07.

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“…The only adjustable parameters in the comparison are the ambient radii and forcing pressures of the bubbles. From Hammer and Frommhold (2001). sured values, and is an indication that the modeling overestimates the amount of water vapor in the bubble.…”

Section: Figmentioning

confidence: 97%

“…Depending on the actual temperatures achieved during collapse, different excitations become dominant in the compressed gas, so that ''thermal emission'' can refer to a large variety of different processes. 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 (Moss et al, 1997;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%

Single Bubble Sonoluminescence

Arakeri¹

2004

Sonoluminescence

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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.

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Sonoluminescence: how bubbles glow

Cited by 44 publications

References 0 publications

Cavitation luminescence from flow over a hydrofoil in a cavitation tunnel

Cavitation luminescence from flow over a hydrofoil in a cavitation tunnel

Including ionisation in a simple model of single-bubble sonoluminescence

Single Bubble Sonoluminescence

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