Experiments on breakup of bubbles in a turbulent flow

Vejražka, Jiří; Zedníková, Mária; Stanovský, Petr

doi:10.1002/aic.15935

Cited by 77 publications

(100 citation statements)

References 48 publications

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“…a demonstrates a good agreement between the present data and the results of Vejrazka et al. . This proves that Weber numbers defined by Eqs.…”

Section: Resultssupporting

confidence: 91%

“…The present data are compared also with results for bubble breakup in a cell with homogeneous turbulence, obtained by Vejrazka et al. . These data were published in dependence on the mother bubble size and energy dissipation rate.…”

Section: Resultssupporting

confidence: 65%

“…Further analysis of the present data and results by Vejrazka et al. (bubbles with 2 < D b < 4.5 mm) provides a different dependence of breakup frequency on bubble size. A different exponent of the function b ∼ D b −2 expresses better the experimental breakup frequencies than the exponent provided in Eq.…”

Section: Resultssupporting

confidence: 49%

“…An equivalent breakage Weber number is calculated assuming homogeneous isotropic turbulence, where the Weber number is defined as the ratio of inertial and capillary stresses expressed using the energy dissipation rate , , , :

true W e * = \frac{2 ρ_{normalC} ε^{2 false/ 3} {D_{normalb}}^{5 false/ 3}}{σ} = \frac{2^{8 false/ 3} ρ_{normalC} ε^{2 false/ 3} {R_{normalb}}^{5 false/ 3}}{σ}

…”

Section: Resultsmentioning

confidence: 99%

“…The tracking procedure is described in detail by Vejrazka et al. and the authors estimated the uncertainty of breakup detection around 5 %.…”

Section: Methodsmentioning

confidence: 99%

See 4 more Smart Citations

Experiments on Bubble Breakup Induced by Collision with a Vortex Ring

et al. 2019

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The bubble breakup after collision with a vortex ring was validated as source of breakup parameters for population balance modeling. This system was chosen as a deterministic alternative to the stochastic nature of bubble breakup studies under turbulent flow. The vortex ring was characterized by combining experimental visualization and numerical simulations. Breakup frequency, mean number of daughter bubbles, and its size distribution were obtained by high‐speed camera recording of the collision process. The dependence of breakup parameters on the size of the mother bubble and Weber number was determined.

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“…a demonstrates a good agreement between the present data and the results of Vejrazka et al. . This proves that Weber numbers defined by Eqs.…”

Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 65%

Section: Resultssupporting

confidence: 49%

true W e * = \frac{2 ρ_{normalC} ε^{2 false/ 3} {D_{normalb}}^{5 false/ 3}}{σ} = \frac{2^{8 false/ 3} ρ_{normalC} ε^{2 false/ 3} {R_{normalb}}^{5 false/ 3}}{σ}

…”

Section: Resultsmentioning

confidence: 99%

“…The tracking procedure is described in detail by Vejrazka et al. and the authors estimated the uncertainty of breakup detection around 5 %.…”

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Experiments on Bubble Breakup Induced by Collision with a Vortex Ring

et al. 2019

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Experimental measurement of bubble breakup in a jet bubbling reactor

et al. 2020

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The bubble breakups in a jet bubbling reactor are captured using a high‐speed camera and the velocity field is measured by particle image velocimetry. Two typical breakup patterns, jet breakup and jet‐vortex breakup are observed. The breakup time interval of the jet‐vortex breakup is two orders of magnitude higher than the jet breakup. The probability of the jet‐vortex breakup and the jet breakup accounting in the total breakup events increases and decreases with the jet velocity and the mother bubble size, respectively. The bubble breakup region increases with the jet velocity. The bubble breakup frequency increases with the turbulent dissipation rate and the mother bubble size. The average number of daughter bubbles increases with the Weber number. An L‐shaped daughter bubble size distribution is observed. Empirical correlations are established for the bubble breakup frequency, the average number of daughter bubbles and daughter bubble size distribution, and fitted well with the experimental results.

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Experimental study on breakup of a single bubble in a stirred tank: Effect of gas density and liquid properties

et al. 2021

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Bubble breakup plays an important role in gas–liquid flows, but detailed studies are still scarce. In this work, the breakup behavior of a single bubble in a stirred tank was experimentally studied with a high‐speed camera, focusing on the effect of gas density, liquid properties, agitation speed, and mother bubble size. The bubble breakup time, breakup probability, breakup rate, and daughter bubble size distribution were determined. The internal‐flow phenomenon that the gas flowed from the smaller part to the larger part of a deformed mother bubble was observed by a high‐speed camera. The results showed that with increasing gas density, agitation speed, mother bubble size and decreasing surface tension, the bubble breakup rate and probability of equal‐size distribution significantly increased. With increasing liquid viscosity, the bubble breakup rate decreased especially in the high viscosity range. An M‐shaped daughter bubble size distribution was observed, which was consistent with our previous bubble breakup model.

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Experiments on breakup of bubbles in a turbulent flow

Cited by 77 publications

References 48 publications

Experiments on Bubble Breakup Induced by Collision with a Vortex Ring

Experiments on Bubble Breakup Induced by Collision with a Vortex Ring

Experimental measurement of bubble breakup in a jet bubbling reactor

Experimental study on breakup of a single bubble in a stirred tank: Effect of gas density and liquid properties

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