Design aspects of sonochemical reactors: Techniques for understanding cavitational activity distribution and effect of operating parameters

Sutkar, Vinayak S.; Gogate, Parag R.

doi:10.1016/j.cej.2009.07.021

Cited by 322 publications

(159 citation statements)

References 75 publications

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“…Upon solution of (4), the thermal, ߎ ௧ , acoustic, by the number of bubbles present in the mixture, N, yields the imaginary part of the wavenumber (given by equation (13)) as a function of driving pressure. The real part of the wavenumber is given by (12).…”

Section: Nonlinear Solution Proceduresmentioning

confidence: 99%

“…The pressure field inside the reactor is simulated as it can be used to predict the regions of high energy bubble clouds, and to optimize the geometry and mode of operations of sonochemical reactors [12]. The obtained distribution of the cavitation zones closely relates to the coating of the textile as the corresponding jet and collapse events significantly contribute to the nanoparticles' impregnation process (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor

Doğan

Popov²

2016

Ultrasonics Sonochemistry

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Section: Nonlinear Solution Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor

Doğan

Popov²

2016

Ultrasonics Sonochemistry

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“…The difficulty of tailoring both frequency and amplitude at a time, together with the directional sensitive effect of ultrasound and its non-uniform volumetric energy density, are the main drawbacks of ultrasound cavitation that may complicate its scale-up [21][22][23][24]. A highintensity, bulk and multi-frequency type of excitation would be the ideal acoustic wave.…”

Section: Introductionmentioning

confidence: 99%

Shock-induced cavitation as a way of accelerating phenol oxidation in aqueous media

Dutilleul

Partaloglu

Costa

et al. 2017

Chemical Engineering and Processing: Process Intensification

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Graphical Abstract2 Highlights  Cavitation induced by the impact of a solid piston on liquid surface  Shock-waves of several bars amplitude exciting a wide frequency range  Phenol degradation initiated at ambient temperature and absence of oxidants  High phenol mineralization extents measured upon H2O2 addition  Accelerated active radical formation in the presence of shock-induced cavitation AbstractShock-induced cavitation phenomena, resulting from the propagation of the trail of shockwaves generated upon the impact of a solid piston on a liquid surface, was used as an innovative way of intensifying the oxidation of phenol in aqueous media. The amount of energy communicated by the impact was found to be proportional to the impact height, and was directly related to the maximal pressure attained, i.e. in the order of several tens of bars. This peak was followed by a rarefaction period that results in the origination of several cavitation phenomena, which continued upon piston rebound and further shock-wave generation and propagation. The multi-frequency nature of shock-induced cavitation, capable of exciting a wide range of frequencies between 1 kHz and 100 kHz, was confirmed by means of wavelet analysis. Under shock-induced cavitation conditions, phenol degradation was found to be possible even in the absence of any oxidizing agent. High extents of mineralization, i.e. 45.3 and 56.2% TOC elimination, 50 mg/L solution, neutral pH, were obtained in the presence of H2O2 (aprox. 10% vol.), pointing to an acceleration of the oxidation reaction based in a faster and more efficient creation of radical species.

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“…A similar hypothesis was previously proposed to rationalize acoustic measurements in an anionic surfactant 21 . A contributing factor to the decrease in inertial cavitation with time in pure water and at 30% cmc may be a preference for stable cavitation as the bulk solution temperature increases during ultrasonication 9,11 . The average variation of solution temperature during ultrasonication at 200 W is shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

“…Thus, the reactor generates a far more uniform cavitation distribution than the sonotrode and potentially a better 'nanoparticle dispersion stimulus' within a larger solution volume. The sonotrode has the additional disadvantage of contamination of the solution with metal fragments eroded from the tip 11 . These considerations point to significant advantages for industrial scale-up of such batch processing.…”

Section: Resultsmentioning

confidence: 99%

Influence of Acoustic Cavitation on the Controlled Ultrasonic Dispersion of Carbon Nanotubes

et al. 2013

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Ultrasonication is the most widely used technique for the dispersion of a range of nanomaterials, but the intrinsic mechanism which leads to stable solutions is poorly understood with procedures quoted in the literature typically specifying only extrinsic parameters such as nominal electrical input power and exposure time. Here we present new insights into the dispersion mechanism of a representative nanomaterial, single-walled carbon nanotubes (SW-CNTs), using a novel upscalable sonoreactor and an in situ technique for the measurement of acoustic cavitation activity during ultrasonication. We distinguish between stable cavitation, which leads to chemical modification of the surface of the CNTs, and inertial cavitation, which favors CNT exfoliation and length reduction. Efficient dispersion of CNTs in aqueous solution is found to be dominated

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Design aspects of sonochemical reactors: Techniques for understanding cavitational activity distribution and effect of operating parameters

Cited by 322 publications

References 75 publications

Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor

Numerical simulation of the nonlinear ultrasonic pressure wave propagation in a cavitating bubbly liquid inside a sonochemical reactor

Shock-induced cavitation as a way of accelerating phenol oxidation in aqueous media

Influence of Acoustic Cavitation on the Controlled Ultrasonic Dispersion of Carbon Nanotubes

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