Model validation for low and high superficial gas velocity bubble column flows

Law, Deify; Battaglia, Francine; Heindel, Theodore J.

doi:10.1016/j.ces.2008.07.001

Cited by 38 publications

(22 citation statements)

References 27 publications

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“…The BP+BIT model predicts a slightly larger gas holdup as compared to the multiphase k-c model but neither 2D case compares well with the experiments. The simulation predicts the experiment well at 1 crnls superficial gas velocity that employs the BP+BIT model, which is expected for a homogeneous flow [30,34].…”

Section: Results and Discussion Bubble Column (Bc) Studymentioning

confidence: 99%

“…The BP model must be employed with a bubble induced turbulence (BIT) model to obtain numerical stability and they are only used for low superficial gas velocity flows (typically homogeneous flow) [29][30]. Sato et al [31] proposed a BIT model proportional to the bubble diameter and slip velocity of the rising bubbles: (18) where the value of the proportionality constant C 8 r is 0.6.…”

Section: Bubble Pressure Modelmentioning

confidence: 99%

See 1 more Smart Citation

Simulating Gas-Liquid Flows in an External Loop Airlift Reactor

Law

Battaglia

Heindel

2008

Volume 10: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B, and C

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The external loop airlift reactor (ELALR) is a modified bubble column reactor that is composed of two vertical columns that are connected with two horizontal connectors. Airlift reactors are utilized in fermentation processes and are preferred over traditional bubble column reactors because they can operate over a wider range of conditions. Computational fluid dynamics (CFD) simulations can be used to enhance our understanding of the hydrodynamics within these reactors. In the present work, the gas-liquid flow dynamics in an external loop airlift reactor are simulated using CFDLib with an Eulerian-Eulerian ensembleaveraging method in two-dimensional (2D) and three-dimensional (3D) coordinate systems. In addition, models are employed for the interphase momentum transfer drag coefficient and turbulence behavior. The CFD simulations for temporal and spatial averaged gas holdup are compared to the experimental measurements of Jones and Heindel [1] who used a 10.2 cm diameter ELALR over a range of superficial gas velocities from 0.5 to 20 cm/s. The effect of specifying a mean bubble diameter size for the CFD modeling is examined. The objectives are to validate 2D and 3D CFD simulations with experimental data in order to predict the hydrodynamics in an airlift reactor for future studies on scale-up and design. ABSTRACTThe external loop airlift reactor (ELALR) is a modified bubble column reactor that is composed of two vertical columns that are connected with two horizontal connectors. Airlift reactors are utilized in fermentation processes and are preferred over traditional bubble column reactors because they can operate over a wider range of conditions. Computational fluid dynamics (CFD) simulations can be used to enhance our understanding of the hydrodynamics within these reactors. In the present work, the gas-liquid flow dynamics in an external loop airlift reactor are simulated using CFDLib with an Eulerian-Eulerian ensemble-averaging method in twodimensional (2D) and three-dimensional (3D) coordinate systems. In addition, models are employed for the interphase momentum transfer drag coefficient and turbulence behavior. The CFD simulations for temporal and spatial averaged gas holdup are compared to the experimental measurements of Jones and Heindel [I] who used a 10.2 em diameter ELALR over a range of superficial gas velocities from 0.5 to 20 cm/s. The effect of specifying a mean bubble diameter size for the CFD modeling is examined. The objectives are to validate 2D and 3D CFD simulations with experimental data in order to predict the hydrodynamics in an airlift reactor for future studies on scale-up and design.

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Section: Results and Discussion Bubble Column (Bc) Studymentioning

confidence: 99%

Section: Bubble Pressure Modelmentioning

confidence: 99%

Simulating Gas-Liquid Flows in an External Loop Airlift Reactor

Law

Battaglia

Heindel

2008

Volume 10: Heat Transfer, Fluid Flows, and Thermal Systems, Parts A, B, and C

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“…Drag coefficient The drag coefficient was important hydrodynamic parameter involved in modeling, which had to be provided as input data (Brucato et al, 1998;Han et al, 2007), and had great influence on gas holdup distribution. Schiller and Naumann drag coefficient model was applicable to gas-liquid system of low gas holdup (Law et al, 2008). The interactions among gas bubbles also enhanced with gas holdup increased.…”

Section: The Motion Equation Wasmentioning

confidence: 99%

γ-CT measurement and CFD simulation of cross section gas holdup distribution in a gas–liquid stirred standard Rushton tank

Liu

Han

et al. 2011

Chemical Engineering Science

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“…Three-phase bubble columns are extensively used in petrochemicals, chemical and the processes of hydrogenation, chlorination, oxidation, hydroformylation, bioremediation and cell growth [1][2][3] and also play an significant role in all types of gas conversion processes, such as direct or indirect coal to liquid processes, and Fischer-Tropsch synthesis [4][5][6]. The flow behaviors of a gas-liquid-solid three-phase flow in bubble columns are complex.…”

Section: Introductionmentioning

confidence: 99%

CFD simulation of hydrodynamics of gas–liquid–solid three-phase bubble column

Wang

2015

Powder Technology

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Model validation for low and high superficial gas velocity bubble column flows

Cited by 38 publications

References 27 publications

Simulating Gas-Liquid Flows in an External Loop Airlift Reactor

Simulating Gas-Liquid Flows in an External Loop Airlift Reactor

γ-CT measurement and CFD simulation of cross section gas holdup distribution in a gas–liquid stirred standard Rushton tank

CFD simulation of hydrodynamics of gas–liquid–solid three-phase bubble column

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