Numerical simulations of gas–liquid mass transfer in bubble columns with a CFD–PBM coupled model

Wang, Tiefeng; Wang, Jinfu

doi:10.1016/j.ces.2007.08.033

Cited by 165 publications

(113 citation statements)

References 49 publications

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“…PBM is an effective method to calculate BSD for gas-liquid flows on the condition that bubble coalescence and breakup models are provided as model closures. Many researchers have used the coupled CFD-PBM model to predict the hydrodynamics and mass transfer in multiphase reactors [9][10][11][12][13][14]. Their studies showed that a better agreement between simulations and experiments was obtained when BSD was considered compared to using a constant mean bubble diameter.…”

Section: Introductionmentioning

confidence: 99%

“…Xing et al [14] investigated the ability of the CFD-PBM coupled model to account for the effect of viscosity on the gas holdup in a bubble column. The feature that the increased viscosity resulted to a decrease in the volume fraction of small bubbles and an increase in the volume fraction of large bubbles was captured well using the developed CFD-PBM model [12,15]. The coupled CFD-PBM simulations of ALR are relatively rare, especially with the viscous or non-Newtonian fluid.…”

Section: Introductionmentioning

confidence: 99%

“…They pointed out that simulations made by implementing PBM produced much better comparison to experiments for gas holdup and liquid velocity than by using mean bubble diameter. Wang and Wang [12] investigated mass transfer in bubble column with the coupled CFD-PBM model and showed that the CFD-PBM coupled model could predict effectively the hydrodynamics and mass transfer. Liu et al [13] performed CFD-PBM coupled simulations of airlift bioreactor for hairy root culture and presented good agreement between simulations and experiments in terms of bubble number density.…”

Section: Introductionmentioning

confidence: 99%

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CFD-PBM Coupled Simulation of an Airlift Reactor with Non-Newtonian Fluid

Han

Sha

Лаари

et al. 2017

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-Hydrodynamics of an AirLift Reactor (ALR) with tap water and non-Newtonian fluid was studied experimentally and by numerical simulations. The Population Balance Model (PBM) with multiple breakup and coalescence mechanisms was used to describe bubble size characteristics in the ALR. The interphase forces for closing the two-fluid model were formulated by considering the effect of Bubble Size Distribution (BSD). The BSD in the ALR obtained from the coupled Computational Fluid Dynamics (CFD)-PBM model was validated against results from digital imaging measurements. The simulated velocity fields of both the gas and liquid phases were compared to measured fields obtained with Particle Image Velocimetry (PIV). The simulated results show different velocity field profile features at the top of the ALR between tap water and nonNewtonian fluid, which are in agreement with experiments. In addition, good agreement between simulations and experiments was obtained in terms of overall gas holdup and bubble Sauter mean diameter. NOMENCLATURE SymbolsVolume fraction of gas/liquid phase, 1 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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CFD-PBM Coupled Simulation of an Airlift Reactor with Non-Newtonian Fluid

Han

Sha

Лаари

et al. 2017

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…The potential of Computational Fluid Dynamics (CFD) for describing the hydrodynamics of bubble column has been established by several publications in the past (Baten and Krishna, 2005; Wang and Wang, 2007). What happens quantitatively, when fluids flow, how fluid flow, how are the velocity vectors, how the pressure contours are predicted by the CFD simulations.…”

Section: Introductionmentioning

confidence: 99%

Axial and Radial Gas Holdup in Bubble Column Reactor

Wagh¹,

Ansari²,

Kene³

2014

Bulletin of the Korean Chemical Society

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Bubble column reactors are considered the reactor of choice for numerous applications including oxidation, hydrogenation, waste water treatment, and Fischer-Tropsch (FT) synthesis. They are widely used in a variety of industrial applications for carrying out gas-liquid and gas-liquid-solid reactions. In this paper, the computational fluid dynamics (CFD) model is used for predicting the gas holdup and its distribution along radial and axial direction are presented. Gas holdup increases linearly with increase in gas velocity. Gas bubbles tends to concentrate more towards the center of the column and follows a wavy path.

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“…The models used for numerical simulations of the gas-liquid two-phase flow in bubble columns mainly include the Euler-Euler two-fluid model [5], Euler-Euler two-fluid model coupled with a population balance model (PBM) [6][7][8] and discrete particle model (DPM) [4]. The PBM accounts for the effects of bubble coalescence and breakup and can predict the local bubble size distribution [9].…”

Section: Introductionmentioning

confidence: 99%

CFD-PBM Approach with Different Inlet Locations for the Gas-Liquid Flow in a Laboratory-Scale Bubble Column with Activated Sludge/Water

et al. 2017

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Abstract:A novel computational fluid dynamics-population balance model (CFD-PBM) for the simulation of gas mixing in activated sludge (i.e., an opaque non-Newtonian liquid) in a bubble column is developed and described to solve the problem of measuring the hydrodynamic behavior of opaque non-Newtonian liquid-gas two-phase flow. We study the effects of the inlet position and liquid-phase properties (water/activated sludge) on various characteristics, such as liquid flow field, gas hold-up, liquid dynamic viscosity, and volume-averaged bubble diameter. As the inlet position changed, two symmetric vortices gradually became a single main vortex in the flow field in the bubble column. In the simulations, when water was in the liquid phase, the global gas hold-up was higher than when activated sludge was in the liquid phase in the bubble column, and a flow field that was dynamic with time was observed in the bubble column. Additionally, when activated sludge was used as the liquid phase, no periodic velocity changes were found. When the inlet position was varied, the non-Newtonian liquid phase had different peak values and distributions of (dynamic) liquid viscosity in the bubble column, which were related to the gas hold-up. The high gas hold-up zone corresponded to the low dynamic viscosity zone. Finally, when activated sludge was in the liquid phase, the volume-averaged bubble diameter was much larger than when water was in the liquid phase.

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Numerical simulations of gas–liquid mass transfer in bubble columns with a CFD–PBM coupled model

Cited by 165 publications

References 49 publications

CFD-PBM Coupled Simulation of an Airlift Reactor with Non-Newtonian Fluid

CFD-PBM Coupled Simulation of an Airlift Reactor with Non-Newtonian Fluid

Axial and Radial Gas Holdup in Bubble Column Reactor

CFD-PBM Approach with Different Inlet Locations for the Gas-Liquid Flow in a Laboratory-Scale Bubble Column with Activated Sludge/Water

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