Global modelling of a gas–liquid–solid airlift reactor

Talvy, Samuel Lucien; Cockx, Arnaud; Liné, Alain

doi:10.1016/j.ces.2005.04.067

Cited by 31 publications

(16 citation statements)

References 16 publications

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“…For a three phase flow, a simplified global model for an internal loop reactor (Talvy et al, 2005) used the closure relations for gas and solid drift velocities based on the drift flux model (Zuber and Findlay, 1965). According to this, there are three closure relations.…”

Section: Techniques For Measuring Liquid Circulation and Mixing Timementioning

confidence: 99%

Characteristics of Local Flow Dynamics and Macro-Mixing in Airlift Column Reactors for Reliable Design and Scale-Up

Gumery¹,

Ein‐Mozaffari²,

Dahman³

2009

International Journal of Chemical Reactor Engineering

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There has been tremendous development within mixing operations in industry. Incomplete knowledge of this process caused serious economic losses to process industries. For optimum yields and the economic potential that goes with better understanding of mixing, research in this field continues to grow. The major forms of mixing in industry are either by mechanical or pneumatic agitation. Airlift bioreactors achieve mixing through pneumatic agitation and have gained attention over two decades for their fluid dynamic characteristics and low power consumption. It has been widely applied in bioprocess industries for production of biochemicals, to wastewater treatment in which the performance of this reactor has been overwhelming with respect to its production levels as compared to the conventional mechanical agitation.In this review, mixing through mechanical and pneumatic agitation is compared. An extensive literature is distilled from various investigators on the hydrodynamics and mixing characteristics of airlift bioreactors. This review has emphasis on factors that affect mixing such as the geometrical parameters of the vessel, gas flow rate, properties of the liquid medium, sparger design and measuring techniques employed. In an attempt to understand process related issues, sophisticated advances in the measuring techniques provides more insight into mixing in this reactor. Thus extensive correlations have been proposed by various investigators to predict the hydrodynamic and mixing parameters. Some design modifications proposed by several scholars have also been reviewed.

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Section: Techniques For Measuring Liquid Circulation and Mixing Timementioning

confidence: 99%

Characteristics of Local Flow Dynamics and Macro-Mixing in Airlift Column Reactors for Reliable Design and Scale-Up

Gumery¹,

Ein‐Mozaffari²,

Dahman³

2009

International Journal of Chemical Reactor Engineering

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“…Because of the complexities associated with carrying out the biological upgrading of petroleum in a large scale unit, a water-in-oil microemulsion, as a cold model, can be used to characterize performance of such bioreactors (Mehrnia et al, 2004a(Mehrnia et al, , 2004bShariati et al, 2007). Compared to the bubble column bioreactors, internal loop airlift bioreactors have advantages, such as relatively constant and mild shear stress throughout the reactor and increased contact area between gas and liquid (Talvy et al, 2005). Most hydrodynamic investigations on airlift and bubble column bioreactors were carried out with air and water, which is different from the real conditions in industrial reactors.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, some researchers have used petroleum-based liquids in such bioreactors and proposed correlations for the hydrodynamics of oil-water systems. Nevertheless, few experimental data are available on the effect of liquid properties of oil-based liquids on the hydrodynamics of bubble column and airlift bioreactors (Shariati et al, 2007;Boltes et al, 2008;Talvy et al, 2005;Mehrnia et al, 2005;Mouza et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamics of an Airlift Bioreactor Treating Petroleum-based Liquids: Experiment and CFDM

Mostoufi

Mehrnia

Vali

2014

Energy Sources, Part A: Recovery, Utilization, and Environmenta

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Bubble diameter as well as total and local gas holdups in an airlift bioreactor with water, diesel, and different water-in-diesel microemulsions was studied. Both 2D and 3D Eulerian models together with experimental bubble diameters were used to simulate the bioreactor. The accuracy of results in the 2D model depends on the bubble diameter. The 3D model was in better agreement with the experiments.

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“…In the past, airlift reactor modeling has been performed at different levels. First, global empirical correlations have been developed31 and global models have been proposed 32. Then, local analysis based on numerical simulations has been developed.…”

Section: Introductionmentioning

confidence: 99%

Gas dispersion in air‐lift reactors: Contribution of the turbulent part of the added mass force

Ali¹,

Chahed²,

Bellakhal³

et al. 2011

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).Gas dispersion in an airlift reactor focusing on the closure law on turbulent contribution of added mass is presented. A data bank for bubbly flow in an airlift reactor is presented. The liquid velocity is measured by hot film anemometry and gas fraction and velocity are measured with an optical probe. The sensitivity of numerical simulations of gas dispersion to the modeling of turbulent contribution of added mass is shown. Without the turbulent contribution, the bubbles move toward the region where the turbulence is high and the pressure is low. When the turbulent contribution is introduced, the bubble migration towards the low pressure region is counter-balanced and the void fraction profile is significantly modified. The modeling of the turbulent contribution of added mass is expressed in terms of the turbulent correlations in the gas phase, u 0 Gi u 0 Gj , that can be related to the Reynolds stress in the liquid phase, u 0 i u 0 j .

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Global modelling of a gas–liquid–solid airlift reactor

Cited by 31 publications

References 16 publications

Characteristics of Local Flow Dynamics and Macro-Mixing in Airlift Column Reactors for Reliable Design and Scale-Up

Characteristics of Local Flow Dynamics and Macro-Mixing in Airlift Column Reactors for Reliable Design and Scale-Up

Hydrodynamics of an Airlift Bioreactor Treating Petroleum-based Liquids: Experiment and CFDM

Gas dispersion in air‐lift reactors: Contribution of the turbulent part of the added mass force

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