Coherent flow structures in bubble column reactors

Joshi, Jyeshtharaj B.; Vitankar, Vivek; Kulkarni, Amol A.; Dhotre, M.T.; Ekambara, K.

doi:10.1016/s0009-2509(02)00192-6

Cited by 121 publications

(77 citation statements)

References 56 publications

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“…while in the heterogeneous regime the bubble interactions are more pronounced and lead to the formation of larger bubbles, which ascend with higher velocity. The homogeneous regime provides a larger interfacial contact area per unit mass of air and thus it is most desirable for practical applications [3], especially those involving sensitive materials (e.g. bioreactors, blood oxygenators) [4,5], since it also provides a low shear rate environment.…”

Section: Introductionmentioning

confidence: 99%

On the Design of Bubble Columns Equipped with a Fine Pore Sparger: Effect of Gas Properties

Ag¹,

Ti²,

Ap³

et al. 2018

Preprint

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Abstract:In our previous works we have proposed design equations that can predict with reasonable accuracy the transition point from homogeneous to heterogeneous regime as well as the gas holdup and the mean Sauter diameter at the homogeneous regime. The validity of the proposed correlations was checked with data obtained using different geometrical configurations and several Newtonian and non-Newtonian liquids as well as the addition of surfactants. However, in all the experiments the gas phase was atmospheric air. This work investigates the effect of gas phase properties by conducting experiments employing various gases (i.e., air, CO 2 , He) that cover a wide range of physical property values. Experiments revealed that only the use of low-density gas (He) has a measurable effect on bubble column performance. More precisely, when the low-density gas (He) is employed, the transition point shifts to higher gas flow rates and the gas holdup decreases, a fact attributed to the lower momentum force exerted by the gas. In view of the new data, the proposed correlations have been slightly modified to include the effect of gas phase properties and it is found that they can predict the aforementioned quantities with an accuracy of ±15%. It has been also proved that CFD simulations are an accurate means for assessing the flow characteristics inside a bubble column.

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Section: Introductionmentioning

confidence: 99%

On the Design of Bubble Columns Equipped with a Fine Pore Sparger: Effect of Gas Properties

Ag¹,

Ti²,

Ap³

et al. 2018

Preprint

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“…The subject of quantification of local turbulent flow structures and reliable estimation of transport properties has been reviewed by Joshi et al [84] and [82,83]. The velocity and pressure data from LES were analyzed using the mathematical techniques such as multiresolution analysis [85], wavelet transforms (discrete and continuous), proper orthogonal decomposition (POD), and hybrid POD-wavelet techniques (Tabib and Joshi [86], Tabib et al [87], Sathe et al [88], and Mathpati et al [89]).…”

Section: Dynamics Of Turbulent Structures and The Estimation Ofmentioning

confidence: 99%

Large Eddy Simulation for Dispersed Bubbly Flows: A Review

Dhotre

Deen

Ničeno

et al. 2013

International Journal of Chemical Engineering

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Large eddy simulations (LES) of dispersed gas-liquid flows for the prediction of flow patterns and its applications have been reviewed. The published literature in the last ten years has been analysed on a coherent basis, and the present status has been brought out for the LES Euler-Euler and Euler-Lagrange approaches. Finally, recommendations for the use of LES in dispersed gas liquid flows have been made.

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“…Over the past thirty years, the research group of Professor J. B. Joshi at the Mumbai University Institute of Chemical Technology has pioneered many of the experimental and computational methods currently used for investigating and modeling the flow behavior in bubble-column reactors 2,[6][7][8][9][10][11][12][13][14] (see also references therein). It is thus with great pleasure that we contribute this paper in honor of his many contributions to the field on the occasion of his 60th birthday.…”

Section: Introductionmentioning

confidence: 99%

Validation of Two-Fluid Simulations of a Pseudo-Two-Dimensional Bubble Column with Uniform and Nonuniform Aeration

Monahan

Fox

2009

Ind. Eng. Chem. Res.

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The multiphase flow simulated in this work corresponds to the pseudo-2D bubble-column experiments at Delft University of Technology (Harteveld et al. Can. J. Chem. Eng. 2003, 81, 389-394). As in the work of Monahan and Fox (AIChE J. 2007, 53, 9-18), the complete set of interphase force models includes drag, added-mass, lift, rotation, and strain. The simulation results are presented in the form of comparisons with the experimental data for the time-averaged gas holdup and the instantaneous and time-averaged air and liquid velocity fields. Overall, the qualitative and quantitative comparisons between experiments and simulations are satisfactory for both uniform and nonuniform aeration. In particular, the model predicts the flow patterns observed in the experiments, but in some cases at slightly different values of the amount of aeration. In the latter cases, it is shown that changing the model parameters does not improve the agreement with experiments. However, changing the liquid-velocity boundary condition from zero stress to zero slip leads to a small improvement. The multiphase flow simulated in this work corresponds to the pseudo-2D bubble-column experiments at Delft University of Technology (Harteveld et al. Can. J. Chem. Eng. 2003, 81, 389-394). As in the work of Monahan and Fox (AIChE J. 2007, 53, 9-18), the complete set of interphase force models includes drag, added-mass, lift, rotation, and strain. The simulation results are presented in the form of comparisons with the experimental data for the time-averaged gas holdup and the instantaneous and time-averaged air and liquid velocity fields. Overall, the qualitative and quantitative comparisons between experiments and simulations are satisfactory for both uniform and nonuniform aeration. In particular, the model predicts the flow patterns observed in the experiments, but in some cases at slightly different values of the amount of aeration. In the latter cases, it is shown that changing the model parameters does not improve the agreement with experiments. However, changing the liquid-velocity boundary condition from zero stress to zero slip leads to a small improvement. Disciplines Biological Engineering | Chemical Engineering

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Coherent flow structures in bubble column reactors

Cited by 121 publications

References 56 publications

On the Design of Bubble Columns Equipped with a Fine Pore Sparger: Effect of Gas Properties

On the Design of Bubble Columns Equipped with a Fine Pore Sparger: Effect of Gas Properties

Large Eddy Simulation for Dispersed Bubbly Flows: A Review

Validation of Two-Fluid Simulations of a Pseudo-Two-Dimensional Bubble Column with Uniform and Nonuniform Aeration

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