Electrochemical determination of the active zones in a high-frequency ultrasonic reactor

Trabelsi, Fethi; Ait-lyazidi, H.; Berlan, J.; Fabre, Paul-Louis; Delmas, Henri; Wilhelm, Anne‐Marie

doi:10.1016/1350-1477(96)00006-y

Cited by 60 publications

(32 citation statements)

References 21 publications

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“…Trabelsi et al investigated mass transfer data produced within a 561 kHz acoustic sound field. 29 They showed, with time averaged results recorded at a 1 mm diameter Pt electrode, that mass transfer coefficients of up to 0.0189 cm s -1 could be recorded within the 561 kHz sound field employed. This study showed that mass transfer was heavily dependent on the position of the electrode within the cell.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical and Photographic Detection of Cavitation Phenomena within a Variable Frequency Acoustic Field

1998

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Electrochemical measurements of localized mass transfer effects within a cavitating liquid (sound field, 20-100 kHz) are reported. The contribution of acoustic streaming to mass transfer recorded at a microelectrode (Pt, 10 µm diameter) is shown to be negligible in comparison to transient events. Active zones, within which high event density was observed, are shown to exist within the liquid. Transient events were recorded, within these active zones, at a frequency as high as ca. 4500/s, which was deemed the limit of resolution of the microelectrode and sort routine employed rather than a cavitation effect. These active zones are shown to be dynamic in nature. Average mass transfer coefficients within these active transient event zones of the order of 0.3 cm s -1 are reported as well as the influence of acoustic pressure on mass transfer within these active zones. Photographic evidence indicates the volume and dynamic nature of the active cavitation zones within the cell.

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Section: Introductionmentioning

confidence: 99%

Electrochemical and Photographic Detection of Cavitation Phenomena within a Variable Frequency Acoustic Field

1998

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“…Some of them intended to correlate physical effects by the dosage of radicals during sonication (Iida et al, 2005;Trabelsi et al, 1996), by calorimetry of thermal response (Margulis and Margulis, 2003) and by acoustic pressure using a hydrophone probe (Jenderka and Koch, 2006;Lewin, 1981;Zeqiri et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Determination of acoustic fields in acidic suspensions of peanut shell during pretreatment with high-intensity ultrasound

Polachini

Carvalho

Telis‐Romero

2017

Braz. J. Chem. Eng.

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-The benefits of high-intensity ultrasound in diverse processes have stimulated many studies based on biomass pretreatment. In order to improve processes involving ultrasound, a calorimetric method has been widely used to measure the real power absorbed by the material as well as the cavitation effects. Peanut shells, a byproduct of peanut processing, were immersed in acidified aqueous solutions and submitted to an ultrasonic field. Acoustic power absorbed, acoustic intensity and power yield were obtained through specific heat determination and experimental data were modeled in different conditions. Specific heat values ranged from 3537.0 to 4190.6 J·kg -1 ·K -1 , with lower values encountered for more concentrated biomass suspensions. The acoustic power transmitted and acoustic intensity varied linearly with the applied power and quadratically with solids concentration, reaching maximum values at higher applied nominal power and for less concentrated suspensions. A power yield of 82.7% was reached for dilute suspensions at 320 W, while 6.4% efficiency was observed for a concentrated suspension at low input energy (80 W).

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“…Almost 2% of the TCE concentration of the spiked sample was recovered in the headspace after 10 minutes of sonication. High ultrasonic irradiation leads to a high mass transfer in liquid and the geyser phenomena near the air/water interface [Trabelsi et al, 1996]. These phenomena enhance volatility of the contaminant.…”

Section: Evaporation Of the Target Compoundmentioning

confidence: 99%

Use of sonication for in-well softening of semivolatile organic compounds. 1997 annual progress report

Peters¹,

Manning

Hoffman

et al. 1997

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Electrochemical determination of the active zones in a high-frequency ultrasonic reactor

Cited by 60 publications

References 21 publications

Electrochemical and Photographic Detection of Cavitation Phenomena within a Variable Frequency Acoustic Field

Electrochemical and Photographic Detection of Cavitation Phenomena within a Variable Frequency Acoustic Field

Determination of acoustic fields in acidic suspensions of peanut shell during pretreatment with high-intensity ultrasound

Use of sonication for in-well softening of semivolatile organic compounds. 1997 annual progress report

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