Über den Einfluß des Ultraschalles auf Diffusionsvorgänge

Frenzel, H; Hinsberg, K.; Schultes, H.

doi:10.1007/bf02595553

Cited by 19 publications

(3 citation statements)

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“…The light emission induced by irradiation of ultrasound was found in 1933 by Marinesco and Trillat,12) and this was followed by experimental verification by Frenzel and Schultes. 13) The intensity of sonoluminescence depends on the species of dissolved gas; rare gases of monoatomic molecule with small specific heat and small heat conductivity such as Ar and Xe emit stronger sonoluminescence. Periodicity in sonoluminescence was found by Günther et al 14) and Negishi showed correspondence with the sound pressure cycle.…”

Section: Sonoluminescence From Bubblesmentioning

confidence: 99%

Micro Bubble and Sonoluminescence

Mitome¹

2001

Jpn. J. Appl. Phys.

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The author reviews the interaction of micro bubbles with ultrasound. First, the action of acoustic radiation pressure on bubbles is discussed in contrast with that on small particles noting the concept of Bjerknes force, resonant bubbles and nonlinear oscillation of bubbles. In the past decade, sonoluminescence, light emission from a single oscillating bubble, attracted attention of researchers because of its strange characteristics. A short history of sonoluminescence and its characteristics are summarized based on bubble motion in a sound field. Lastly, industrial and medical applications of extreme environment generated by collapsing micro bubbles are discussed as promising technology in the new century.

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Section: Sonoluminescence From Bubblesmentioning

confidence: 99%

Micro Bubble and Sonoluminescence

Mitome¹

2001

Jpn. J. Appl. Phys.

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“…[22,40]). In the case of a rarefaction wave (P 1 < P 0 , S 0 = S 1 ), the density can be calculated by root finding the EOS relationship for entropy as a function of density and pressure where the lower bound of density is given as the vacuum density (10 −28 g/cm 3 ) and the upper bound is the value of the ahead state. In the case of tabulated EOS, performance optimization can be achieved by precomputing a table of ρ(P ,S) to allow direct interpolation for density.…”

Section: Thermodynamic Functionsmentioning

confidence: 99%

“…Among many examples, cavity collapse is known to destroy ship propellers [1] and can be used to sensitize explosives [2]. More relevant to the present work is the observation of bright flashes of light from collapsing cavities [3][4][5][6][7]. The most widely researched example of this phenomenon is single-bubble sonoluminescence (SBSL), where a single gas cavity is ultrasonically driven to stably oscillate between ∼1 to 50 μm radius [4].…”

Section: Introductionmentioning

confidence: 99%

Modeling asymmetric cavity collapse with plasma equations of state

2016

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We explore the effect that equation of state (EOS) thermodynamics has on shock-driven cavity-collapse processes. We account for full, multidimensional, unsteady hydrodynamics and incorporate a range of relevant EOSs (polytropic, QEOS-type, and SESAME). In doing so, we show that simplified analytic EOSs, like ideal gas, capture certain critical parameters of the collapse such as velocity of the main transverse jet and pressure at jet strike, while also providing a good representation of overall trends. However, more sophisticated EOSs yield different and more relevant estimates of temperature and density, especially for higher incident shock strengths. We model incident shocks ranging from 0.1 to 1000 GPa, the latter being of interest in investigating the warm dense matter regime for which experimental and theoretical EOS data are difficult to obtain. At certain shock strengths, there is a factor of two difference in predicted density between QEOS-type and SESAME EOS, indicating cavity collapse as an experimental method for exploring EOS in this range.

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Ultrasound enhanced bioprocesses: Cholesterol oxidation by Rhodococcus erythropolis

Bar

1988

Biotech & Bioengineering

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Cholesterol oxidation to cholestenone by resting cells of Rhodococcus erythropolis ATCC25544 was investigated under a computer-controlled ultrasonic irradiation at a frequency of 20 kHz. The optimization of the ultrasound intensity and its mode of application to a stirred bioreactor was first established at a level which preserved the structural integrity of the cells and enabled their metabolic activity. A significant enhancement in the kinetic rates of the biotransformation was observed in microbial slurries of 1.0 and 2.5 g/L cholesterol when sonicated for 5 s every 10 min with a power output of 2.2 W/cm(2). In contrast, ultrasound had no effect on the enzymatic oxidation of cholesterol (2.5 g/L) by cholesterol oxidase. A high loading of cholesterol (5.0 g/L) in sonicated microbial systems had, however, an adverse effect. The ultrasound enhancement is discussed in terms of an increased dissolution rate of the sustrate crystals and more importantly, in terms of the uniquely ultrasound-induced enhancement of mass transfer inside and outside a cell.

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Über den Einfluß des Ultraschalles auf Diffusionsvorgänge

Cited by 19 publications

References 1 publication

Micro Bubble and Sonoluminescence

Micro Bubble and Sonoluminescence

Modeling asymmetric cavity collapse with plasma equations of state

Ultrasound enhanced bioprocesses: Cholesterol oxidation by Rhodococcus erythropolis

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