Numerical Analysis and Experimental Validation of Bubble Size Distributions in Two-Phase Bubble Column Reactors

Bertola, F.; Grundseth, J.; Hagesaether, Lars; Dorao, Carlos Alberto; Luo, Hao; Hjarbo, Kai; Svendsen, Hallvard F.; Vanni, Marco; Baldi, Giancarlo; Jakobsen, Hugo A.

doi:10.1615/multscientechn.v17.i1-2.70

Cited by 13 publications

(12 citation statements)

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“…Coalescence rate was found about one order of magnitude higher than the breakage rate in their work. A plausible explanation for this discrepancy could be attributed to the error embedded in the turbulent dissipation rate prediction (Bertola et al, 2003).…”

Section: Resultsmentioning

confidence: 99%

On the numerical study of isothermal vertical bubbly flow using two population balance approaches

Cheung

Yeoh

2007

Chemical Engineering Science

104

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Two population balance approaches based on the MUltiple-SIze-Group (MUSIG) model and one-group Average Bubble Number Density (ABND) model for handling the bubble size distribution of gas-liquid bubbly flows under isothermal conditions are assessed. Three forms of coalescence and breakage mechanisms by Wu et al. (1998), Hibiki and Ishii (2002) and Yao and Morel (2004) are incorporated in the ABND model. To examine the relative merits of both approaches, local radial distributions of five primitive variables in bubbly flows: void fraction, Sauter mean bubble diameter, interfacial area concentration, and gas and liquid velocities, are compared against the experimental data of Liu and Bankoff (1993a,b) and Hibiki et al. (2001). In general, both of the ABND model and MUSIG model predictions yield close agreement with experimental results. To account for the range of different bubble sizes in the gas-liquid bubbly flows, the resolution required is achieved through the application of the MUSIG model. Nevertheless, computational times increase by a factor of two when compared to applying the simpler ABND model. To further exploit the models' capabilities, investigations are carried out by extending the two population approaches beyond the bubbly flow regime of higher void fraction, particularly in the transition regime. The numerical results are found to be grossly over-predicted, which expose the inherent limitations of the models. It is known that bubbles in this regime are generally highly distorted and closely packed instead of spherically shape and allowed to move freely in bubbly flow regime.

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Section: Resultsmentioning

confidence: 99%

On the numerical study of isothermal vertical bubbly flow using two population balance approaches

Cheung

Yeoh

2007

Chemical Engineering Science

104

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Section: Resultsmentioning

confidence: 99%

On the modelling of population balance in isothermal vertical bubbly flows—Average bubble number density approach

Cheung

Yeoh

2007

Chemical Engineering and Processing: Process Intensification

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“…The model proposed by Luo and Svendsen was quite different from other models since it needs no adjustable or experimentally‐determined parameter. This model was based on the theories of isotropic turbulence and probability and has been widely used in the literature . Based on the same framework, several attempts have been made to improve this model .…”

Section: Introductionmentioning

confidence: 99%

Theoretical model for multiple breakup of fluid particles in turbulent flow field

Razzaghi

2016

AIChE Journal

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Generalized phenomenological model, based on the theories of probability and isotropic turbulence, is developed for multiple breakup of fluid particles in turbulent flow field. The approach uses a series of successive binary breakup events occur at a time scale comparable to the colliding eddy turnover time. It was found that the use of energy density, instead of energy, will increase the predicted binary breakup rate which is usually underestimated by the existing models in the literature. Generalization of the binary breakup model for multiple fragmentations is performed by defining a “remaining energy function” for the colliding eddy which means the contribution of original eddy to the later breakup events. For ternary breakage, the model shows a reasonably good agreement with the experimental data. The quaternary fragmentation frequency, however, is of negligible importance at lower energy dissipation rates but its contribution to breakage fraction at higher energy dissipation rates becomes considerable. The results also show that ternary and quaternary breakups have a considerable 90% contribution to the overall fragmentation, while pentenary and further fragmentations are of lower importance at low energy dissipation rates. At higher levels of energy dissipation rate, fragmentations up to six daughter particles contribute to more than 95% of the overall fragmentations. © 2016 American Institute of Chemical Engineers AIChE J, 62: 4508–4525, 2016

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Numerical Analysis and Experimental Validation of Bubble Size Distributions in Two-Phase Bubble Column Reactors

Cited by 13 publications

References 0 publications

On the numerical study of isothermal vertical bubbly flow using two population balance approaches

On the numerical study of isothermal vertical bubbly flow using two population balance approaches

On the modelling of population balance in isothermal vertical bubbly flows—Average bubble number density approach

Theoretical model for multiple breakup of fluid particles in turbulent flow field

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