Cavitation produced by Ultrasonics

Noltingk, B E; Neppiras, E.A.

doi:10.1088/0370-1301/63/9/305

Cited by 572 publications

(219 citation statements)

References 8 publications

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“…Extremely harsh conditions are produced by the collapse of a cavitation bubble. This collapse generates transient hot spots with local temperatures and pressures of several thousand Kelvin and hundreds of atmospheres [56,57]. Under these conditions, standard solvents are in the supercritical state, thus providing a promoting medium for certain reactions [16,58].…”

Section: Mode Of Ultrasound Actionmentioning

confidence: 99%

Effect of ultrasound on ester hydrolysis in aqueous ethanol

Tuulmets

Salmar

2001

Ultrasonics Sonochemistry

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Section: Mode Of Ultrasound Actionmentioning

confidence: 99%

Effect of ultrasound on ester hydrolysis in aqueous ethanol

Tuulmets

Salmar

2001

Ultrasonics Sonochemistry

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“…It has been known for a long time that bubbles in water oscillating in an ultrasound field emit sound (Minnaert 1933;Noltingk & Neppiras 1950;Leighton 1994). The spectral components of the emitted sound consist of harmonics and subharmonics of the incident sound wave centre frequency and broadband noise (Lauterborn & Holzfuss 1991).…”

Section: Introductionmentioning

confidence: 99%

Acoustic energy radiated by nonlinear spherical oscillations of strongly driven bubbles

Holzfuss

2010

Proc. R. Soc. A.

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Based on the theory of F. Gilmore (Gilmore 1952 The growth or collapse of a spherical bubble in a viscous compressible liquid) for radial oscillations of a bubble in a compressible medium, the sound emission of bubbles in water driven by high-amplitude ultrasound is calculated. The model is augmented to include expressions for a variable polytropic exponent, hardcore and water vapour. Radiated acoustic energies are calculated within a quasi-acoustic approximation and also a shock wave model. Isoenergy lines are shown for driving frequencies of 23.5 kHz and 1 MHz. Together with calculations of stability against surface wave oscillations leading to fragmentation, the physically relevant parameter space for the bubble radii is found. Its upper limit is around 6 mm for the lower frequency driving and 1-3 mm for the higher. The radiated acoustic energy of a single bubble driven in the kilohertz range is calculated to be of the order of 100 nJ per driving period; a bubble driven in the megahertz range reaches two orders of magnitude less. The results for the first have applications in sonoluminescence research. Megahertz frequencies are widely used in wafer cleaning, where radiated sound may be implicated as responsible for the damage of nanometre-sized structures.

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“…A Rayleigh-Plesset models or its variants have been developed mainly by Plesset [7], Noltingk and Neppiras [8], Poritsky [9]. A more advanced model was developed by Gilmore [10] by incorporating the effects of sound irradiation for oscillating bubbles.…”

Section: Physical Oscillations Of Cavitation Bubblesmentioning

confidence: 99%

Enhancement of heat and mass transfer by cavitation

Zhang

Xian

2015

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this paper, a brief summary of effects of cavitation on the heat and mass transfer are given. The fundamental studies of cavitation bubbles, including its nonlinearity, rectified heat and mass diffusion, are initially introduced. Then selected topics of cavitation enhanced heat and mass transfer were discussed in details including whales stranding caused by active sonar activity, pool boiling heat transfer, oscillating heat pipe and high intensity focused ultrasound treatment.

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Cavitation produced by Ultrasonics

Cited by 572 publications

References 8 publications

Effect of ultrasound on ester hydrolysis in aqueous ethanol

Effect of ultrasound on ester hydrolysis in aqueous ethanol

Acoustic energy radiated by nonlinear spherical oscillations of strongly driven bubbles

Enhancement of heat and mass transfer by cavitation

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