The mechanism of generation of acoustic streaming

Mitome, Hideto

doi:10.1002/(sici)1520-6440(199810)81:10<1::aid-ecjc1>3.0.co;2-9

Cited by 61 publications

(51 citation statements)

References 10 publications

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“…Any bubble deformation tending away from asymmetry causes translational motion, thus, where surface instabilities occur, acoustic streaming will be present [57,143,144]. In the absence of bubbles acoustic streaming can still occur due to the viscosity of the fluid, this is then further influenced by any fluid motion or acoustic nonlinearity [145]. Bubble surface motion in the vicinity of a boundary or hard surface causes the formation of microjets [146].…”

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: Pressure Amplitudementioning

confidence: 99%

“…These waves are often referred to as a (quasi) acoustic streaming phenomenon with flow associated with the travelling part of the sound field [145,157]. The ratio between standing and travelling waves changes as a function of frequency with travelling waves dominating at high frequencies [44,156].…”

Section: Frequencymentioning

confidence: 99%

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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“…In particular, this scaling is claimed to be observed experimentally by Frenkel et al, 4 Nowicki et al 41,42 and Mitome. 40 A deeper discussion about these observations is proposed in Sec. IV of this paper.…”

Section: B Viscosity Dominated Regime Far From the Origin Of The Jetmentioning

confidence: 99%

“…4,37,[40][41][42] The results are all described in dimensional variables and most of these experiments are conducted with water, in which a more or less limited amount of particles is added to serve as tracers. They differ in particular by the size and geometry of the water tank and by the values of the ultrasound frequency and intensity.…”

Section: Introductionmentioning

confidence: 99%

Scaling and dimensional analysis of acoustic streaming jets

et al. 2014

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This paper focuses on acoustic streaming free jets. This is to say that progressive acoustic waves are used to generate a steady flow far from any wall. The derivation of the governing equations under the form of a nonlinear hydrodynamics problem coupled with an acoustic propagation problem is made on the basis of a time scale discrimination approach. This approach is preferred to the usually invoked amplitude perturbations expansion since it is consistent with experimental observations of acoustic streaming flows featuring hydrodynamic nonlinearities and turbulence. Experimental results obtained with a plane transducer in water are also presented together with a review of the former experimental investigations using similar configurations. A comparison of the shape of the acoustic field with the shape of the velocity field shows that diffraction is a key ingredient in the problem though it is rarely accounted for in the literature. A scaling analysis is made and leads to two scaling laws for the typical velocity level in acoustic streaming free jets; these are both observed in our setup and in former studies by other teams. We also perform a dimensional analysis of this problem: a set of seven dimensionless groups is required to describe a typical acoustic experiment. We find that a full similarity is usually not possible between two acoustic streaming experiments featuring different fluids. We then choose to relax the similarity with respect to sound attenuation and to focus on the case of a scaled water experiment representing an acoustic streaming application in liquid metals, in particular, in liquid silicon and in liquid sodium. We show that small acoustic powers can yield relatively high Reynolds numbers and velocity levels; this could be a virtue for heat and mass transfer applications, but a drawback for ultrasonic velocimetry.

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“…In a linear expansion of the time-averaged sound pressure, <p>, the first order terms do not contribute and including only terms up to the second order gives, 11,22,24 hpi…”

Section: Theoretical Modelmentioning

confidence: 99%

Effective mixing of laminar flows at a density interface by an integrated ultrasonic transducer

Johansson

Nikolajeff

et al. 2009

Lab Chip

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An acoustic mixer for glass channel microfluidic systems is presented. An acoustic standing wave, perpendicular to the fluid flow, is generated by the excitation of a miniaturized piezoelectric transducer operated around 10 MHz. The transducer is fabricated into a planar printed circuit board structure, constituting the bottom channel wall, which makes the mixer simple to integrate with a wide selection of microfluidic channel designs. The mixing occurs at a fluid-fluid density interface due to the acoustic radiation force; an analytical expression is derived to qualitatively describe this phenomenon. Only a small density difference in the range of 2-5% is required to achieve 150-270% peak broadening of a fluorescent sample between sheath flows, which we use as a measure of the mixing efficiency. The mixing efficiency is measured with regard to its sensitivity to the density difference, the fluid velocity and the transducer driving frequency. Transducers at different positions along the microchannel make it possible to compare the mixing of straight versus diagonal flows across the transducer surface. We finally demonstrate enhanced chemical lysis of E. coli K12 cells in the device due to active fluid mixing.

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The mechanism of generation of acoustic streaming

Cited by 61 publications

References 10 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

Scaling and dimensional analysis of acoustic streaming jets

Effective mixing of laminar flows at a density interface by an integrated ultrasonic transducer

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