Liquid flow and phase holdup—measurement and CFD modeling for two-and three-phase bubble columns

Michele, Volker; Hempel, D. C.

doi:10.1016/s0009-2509(02)00051-9

Cited by 95 publications

(53 citation statements)

References 9 publications

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“…4,6,[13][14][15][16]19,[21][22][23][24][25][26][28][29][30][31][34][35][36][37]41,[48][49][50][51][52][53] It can be observed that important aspects such as (1) bubble-bubble interactions; (2) two-phase turbulence modeling; (3) gas-liquid interfacial mass, momentum, and energy-transfer mechanisms; (4) coupling between the phases; and (5) the required grid resolution still need to be resolved. Moreover, as a general rule, most literature studies have been limited to the prediction of one particular flow regime (such as churn-turbulent flow).…”

Section: Introductionmentioning

confidence: 99%

CFD predictions for flow‐regime transitions in bubble columns

2005

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Section: Introductionmentioning

confidence: 99%

CFD predictions for flow‐regime transitions in bubble columns

2005

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“…It is important to keep in mind that the experimental water velocity must be lower than the actual velocity, since the particle has a lower velocity than the water itself. (Michele and Hempel, 2002) At t = 1 s, air bubbles were beginning to lift inside the draft tube and for t = 100, bubble plume was oscillating. The behavior is similar for both, the experimental and the computational system, proving that the dynamic of the real fluid flow reflects on the oscillations of the computational two-phase flow.…”

Section: Experimental Validationmentioning

confidence: 99%

CFD simulation of multiphase flow in an airlift column photobioreactor

Freites¹

2014

Global NEST Journal

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A Computational Fluid Dynamics (CFD) simulation using CFX, ANSYS 11.0, has been carried out using a multiphase flow model with an Eulerian-Eulerian approach for an airlift column photobioreactors (PBR). Transient simulations were performed for three inlet air flow, 2, 3 and 5 l min . The contours for gas holdup, air and water velocity showed that the presence of gas phase (air bubbles) is lower in the downcomer but larger in the riser, which leads to require a vigorous mixing in the riser that will be sufficient for a continuous flow. For air, velocity vectors show that they are smaller in the downcomer than in the riser. Nevertheless, water velocity vectors are organized, pointing down in the downcomer and up in the riser. Water shear stress rate contours analysis showed that, shear stress rate regions are considerably larger in the riser, but lower in the downcomer. Due to fewer restrictions to the liquid phase in the riser, a large amount of energy is dissipated by gas liquid interactions. In the downcomer region, gas phase is almost inexistent, and so are the bubble collisions. Finally, the kinetic energy is larger at the top region of the riser, meanwhile is lower at the downcomer. Similar results are observed for energy dissipation rate.

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“…15,16 There are numerous studies that have applied either the Euler-Euler or the Euler-Lagrange approach within 2D or 3D two-fluid turbulent models. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] Large-eddy simulation (LES) studies have also been reported in the literature. 33,34 Additionally, several researchers have reported on the prediction of flow-regime transitions using either numerical simulations 35 or linear stability analysis of various model equations.…”

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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Liquid flow and phase holdup—measurement and CFD modeling for two-and three-phase bubble columns

Cited by 95 publications

References 9 publications

CFD predictions for flow‐regime transitions in bubble columns

CFD predictions for flow‐regime transitions in bubble columns

CFD simulation of multiphase flow in an airlift column photobioreactor

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

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