CFD simulation of sparger design and height to diameter ratio on gas hold-up profiles in bubble column reactors

Dhotre, M.T.; Ekambara, K.; Joshi, Jyeshtharaj B.

doi:10.1016/j.expthermflusci.2003.06.001

Cited by 66 publications

(53 citation statements)

References 12 publications

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“…In bubble columns, the surface tension effect is similar to what is observed for single bubbles: a decrease in surface tension decreases bubble size and bubble velocity (Camarasa et al, 1999;Dargar and Macchi, 2006); this induces higher gas holdup (Kantak et al, 1995;Zahradnik et al, 1995Zahradnik et al, , 1997Camarasa et al, 1999;Krishna et al, 2000;Elgozali et al, 2002;Dhotre et al, 2004;Veera et al, 2004;Mouza et al, 2005) and higher mass transfer coefficient (Kantarci et al, 2005). These tendencies are confirmed by the classical correlations (Shah et al, 1982).…”

Section: Introductionsupporting

confidence: 80%

Hydrodynamics and mass transfer in bubble column: Influence of liquid phase surface tension

Chaumat¹,

Billet²,

Delmas³

2007

Chemical Engineering Science

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Section: Introductionsupporting

confidence: 80%

Hydrodynamics and mass transfer in bubble column: Influence of liquid phase surface tension

Chaumat¹,

Billet²,

Delmas³

2007

Chemical Engineering Science

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“…To the best of our knowledge, there are no experimental results concerning bubble columns with diameter less than 10 cm, equipped with fine porous sparger. Dhotre et al [19], who have numerically studied the effect of sparger type and height to diameter ratio on radial gas holdup profiles, report that for multipoint spargers, an increase of the column height to column diameter ratio results into marginal decrease of gas holdup. Obviously, when the column diameter decreases the wall effects become more intense.…”

Section: Gas Holdupmentioning

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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“…[7] In the heterogeneous regime the bubble size is governed by the coalescence-breakup equilibrium. In bubble columns, the surface tension effect is similar to the trend for single bubbles; a decrease in surface tension decreases bubble size and bubble velocity [52] and induces higher gas holdup [14,53,54] and higher mass transfer coefficient. [55] Consequently the decrease in surface tension increases the efficiency of mass transfer as shown in Fig.…”

Section: Effect Of Surface Tension On Mass Transfer Efficiency Of Bubmentioning

confidence: 59%

“…[26] and Schumpe and Lühring. [34] The mass transfer coefficient for the analysis was considered within the range of correlation equation presented in Eqn (14). The experiments for mass transfer operation in the bubble column were carried out by several authors with different operating variables.…”

Section: The Operating Variables Considered In This Studymentioning

confidence: 99%

Efficiency of non‐reactive isothermal bubble column based on mass transfer

Majumder

2008

Asia-Pacific J Chem Eng

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Bubble column reactor as a gas-liquid contactor is extensively used in the chemical and biochemical industries. Mass transfer coefficients governing the transport processes in bubble contactors are a growing concern in chemical and biotechnological processes whose rates are often limited by the mass transfer rate. The influences of different physical, dynamic and geometric variables affect the efficiency characterization of the equipment which are involved in gas/liquid mass transfer processes. This characterization has great importance to optimize the process plant design. In this article, efficiency of two-phase mass transfer in bubble column reactors has been analyzed based on dynamic, geometric and physical variables of the system. An empirical correlation for mass transfer efficiency has also been developed in terms of those variables. The present analysis on the gas-liquid mass transfer efficiency of bubble column may give insight into a further understanding and modeling of multiphase reactors in industrial applications.

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CFD simulation of sparger design and height to diameter ratio on gas hold-up profiles in bubble column reactors

Cited by 66 publications

References 12 publications

Hydrodynamics and mass transfer in bubble column: Influence of liquid phase surface tension

Hydrodynamics and mass transfer in bubble column: Influence of liquid phase surface tension

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

Efficiency of non‐reactive isothermal bubble column based on mass transfer

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