On the physical origin of conical bubble structure under an ultrasonic horn

Dubus, Bertrand; Vanhille, Christian; Campos-Pozuelo, Cleofé; Granger, C.

doi:10.1016/j.ultsonch.2010.03.003

Cited by 46 publications

(22 citation statements)

References 11 publications

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“…A thin layer of bubbles is formed at the horn surface which impedes the sound field's propagation and causes a reduction in pressure amplitude beyond its formation. This has been confirmed with measurements of pressure amplitude when the bubble layer is the size of an acoustic half wavelength, in this instance the impedance suddenly drops [138]. It has been suggested that travelling waves are more prevalent for the horn and that transient bubbles dominate [44,48].…”

Section: Transducer Typesupporting

confidence: 59%

“…Quasi acoustic streaming is caused by attenuation of the sound field, often influenced by the presence of bubbles causing the formation of an energy gradient in the direction of the fields propagation [135]. The radiation pressure as a result causes motion of the bubbles and an associated macroscopic flow (due to bubble motion and viscosity of the solution) in that direction [136][137][138]. Aside from influencing bubble dynamics, quasi acoustic streaming also reduces the degree of reflection of the sound field and distorts the standing wave component [117].…”

Section: Pressure Amplitudementioning

confidence: 99%

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A parametric review of sonochemistry: Control and augmentation of sonochemical activity in aqueous solutions

Wood

Lee

Bussemaker

2017

Ultrasonics Sonochemistry

260

137

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Please cite this article as: R.J. Wood, J. Lee, M.J. Bussemaker, A parametric review of sonochemistry: control and augmentation of sonochemical activity in aqueous solutions, Ultrasonics Sonochemistry (2017), doi: http:// dx.doi.org/10. 1016/j.ultsonch.2017.03.030 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A parametric review of sonochemistry: control and augmentation of sonochemical activity in aqueous solutions

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Section: Transducer Typesupporting

confidence: 59%

Section: Pressure Amplitudementioning

confidence: 99%

A parametric review of sonochemistry: Control and augmentation of sonochemical activity in aqueous solutions

Wood

Lee

Bussemaker

2017

Ultrasonics Sonochemistry

260

137

View full text Add to dashboard Cite

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“…This fact has already been observed by the authors in other numerical and experimental works referred to bubbly media [16,9], in particular when waves interferences occur [17,10,13]. The nonlinear bubble vibration strongly affects the distribution of energy in the frequency domain but not the distribution of energy in space, which remains highly concentrated at the focus.…”

Section: Examplesupporting

confidence: 53%

Two-dimensional Numerical Simulations of Nonlinear Ultrasonic Propagation in Bubbly Liquids

Vanhille¹,

Campos-Pozuelo²

2010

International Journal of Nonlinear Sciences and Numerical Simulation

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This paper deals with the numerical prediction of the behavior of two-dimensional (2-D) ultrasonic waves in bubbly liquids. The purpose of this work is to simulate the propagation of high-amplitude signals in the nonlinear, dissipative (viscous damping), and dispersive bubbly media. A 2-D nonlinear differential system written in acoustic pressure and bubble volume variation, for which the bubbles are spherical and all of the same size, is solved by means of a finite-differences scheme. The numerical simulations allow us to distinguish the nonlinear results obtained at high-amplitude excitations from the linear response obtained at small-amplitude excitations. Several configurations are presented. Acoustic pressure and bubble volume variation are shown. The effects of the dynamics of the bubbles (nonlinearity, dispersion, dissipation) on the acoustic pressure field are analyzed.

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“…The authors further proved theoretically that the acoustic amplitude of the emitted wave is strongly reduced by cavitation. In 2010, Debus and co-workers [8] explained the physical origin of CBS in terms of the amplification of acoustic pressure in a thin bubbly layer lying at the horn surface.…”

Section: Some Recent Related Results By Other Workersmentioning

confidence: 99%

Cavitation field from a horn—A new model

Chen

Bai

et al. 2010

Sci. China Phys. Mech. Astron.

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The cavitation field from a horn-type transducer is experimentally probed by the optical method. Based on these observations, we propose a model of the field which hypothesizes that most violent caviation bubbles originate from the vibrating surface and there-from fast drift to the near liquid region. These bubbles are chiefly responsible for the practical applications of cavitation for a large power input to the transducer. During migration they become weakened. Cavitation bubbles are also produced in the liquid region by the acoustic wave directly emitted by the transducer, but these bubbles are weak due to the shielding effect of the bubbles clinging to the transducer vibrating surface. Consequently, only weak cavitation bubbles exist in the far liquid region. cavitation field, horn-type transducer, direct observation, new model PACS: 43.25.YW, 43.25.+d

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On the physical origin of conical bubble structure under an ultrasonic horn

Cited by 46 publications

References 11 publications

A parametric review of sonochemistry: Control and augmentation of sonochemical activity in aqueous solutions

A parametric review of sonochemistry: Control and augmentation of sonochemical activity in aqueous solutions

Two-dimensional Numerical Simulations of Nonlinear Ultrasonic Propagation in Bubbly Liquids

Cavitation field from a horn—A new model

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