Surface Acoustic Cavitation Understood via Nanosecond Electrochemistry. 2. The Motion of Acoustic Bubbles

Maisonhaute, Emmanuel; Brookes, Benjamin A.; Compton, Richard G.

doi:10.1021/jp013448a

Cited by 47 publications

(35 citation statements)

References 19 publications

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“…These were conducted over a range from 0.05 Pa to 10 Pa (Dijkink & Ohl 2008). Maisonhaute et al (2002b) provided a rough yet considerably higher estimate based on their earlier electrochemical measurements of the flow velocity of around 200 m/s at the distance of 40 to 80 nm to the boundary (Maisonhaute et al 2002a). They predict that shear stress from oscillating and jetting bubbles driven by ultrasound could provide 25 − 50 bar.…”

Section: Discussionmentioning

confidence: 99%

Wall shear stress from jetting cavitation bubbles

et al. 2018

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The collapse of a cavitation bubble near a rigid boundary induces a high-speed transient jet accelerating liquid onto the boundary. The shear flow produced by this event has many applications, examples are surface cleaning, cell membrane poration, and enhanced cooling. Yet the magnitude and spatio-temporal distribution of the wall shear stress are not well understood, neither experimentally nor by simulations. Here we solve the flow in the boundary layer using an axisymmetric compressible Volume of Fluid (VOF) solver from the OpenFOAM framework and discuss the resulting wall shear stress generated for a non-dimensional distance, γ = 1.0 (γ = h/R max , where h is the distance of the initial bubble centre to the boundary, R max the maximum spherical equivalent radius of the bubble). The calculation of the wall shear stress is found reliable once the flow region with constant shear rate in the boundary layer is determined. Very high wall shear stresses of 100 kPa are found during the early spreading of the jet followed by complex flows composed of annular stagnation rings and secondary vortices. Although the simulated bubble dynamics agrees very well with experiments we obtain only qualitative agreement with experiments due to inherent experimental challenges.

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Section: Discussionmentioning

confidence: 99%

Wall shear stress from jetting cavitation bubbles

et al. 2018

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“…When the electrode is poised at a constant potential corresponding to electrolysis of an electroactive probe, a series of sharp peak currents corresponding to a single bubble evolving close to the electrode surface is observed ( Figure 5). Chronoamperograms reveal a shift from rather stable (Figure 5b) to transient cavitation (Figure 5d) when the acoustic pressure increases, that is, when the electrode/sonic horn distance diminishes (30)(31)(32). In the case of stable cavitation, the periodic peaks reflect a nonharmonic oscillatory behavior of the bubble at the same frequency as the acoustic field (20 kHz).…”

Section: Life Of An Acoustic Bubblementioning

confidence: 96%

When Voltammetry Reaches Nanoseconds

Amatore

Maisonhaute²

2005

Anal. Chem.

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100

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“…As a result it has been shown that i) extremely fast rates of mass transport (shorter analysis times) can be achieved [93], ii) in situ electrode cleaning/activation even in −dirty× media is possible [94], iii) liberation of metal cations from a complex matrix has been observed [95], iv) direct analytical measurements in the presence of/aided by biphasic emulsion systems is possible [96], and v) with high (nanosecond) time resolution electrochemical experiments providing information about surface properties are possible [97,98]. For electroanalysis these improvements mean faster procedures, better signal to background ratios, and in some cases in situ methodology replacing laborious sample pre-treatment procedures.…”

Section: Electroanalytical Procedures Based On Solution Phase Processesmentioning

confidence: 99%

Electroanalysis at Diamond‐Like and Doped‐Diamond Electrodes

2003

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Diamond as a high performance material occupies a special place due to its in many ways extreme properties, e.g., hardness, chemical inertness, thermal conductivity, optical properties, and electric characteristics. Work mainly over the last decade has shown that diamond also occupies a special place as an electrode material with interesting applications in electroanalysis. When made sufficiently electrically conducting for example by boron-doping, −thin film× and −free ± standing× diamond electrodes exhibit remarkable chemical resistance to etching, a wide potential window, low background current responses, mechanical stability towards ultrasound induced interfacial cavitation, a low −stickiness× in adsorption processes, and a high degree of −tunability× of the surface properties. This review summarizes some of the recent work aimed at applying conductive (boron-doped) diamond electrodes to improve procedures in electroanalysis.

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Surface Acoustic Cavitation Understood via Nanosecond Electrochemistry. 2. The Motion of Acoustic Bubbles

Cited by 47 publications

References 19 publications

Wall shear stress from jetting cavitation bubbles

Wall shear stress from jetting cavitation bubbles

When Voltammetry Reaches Nanoseconds

Electroanalysis at Diamond‐Like and Doped‐Diamond Electrodes

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