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Experiments and modelling of a draft tube airlift reactor operated at high gas throughputs

Colombet, Damien and Cockx, Arnaud and Guiraud, Pascal and Legendre, Dominique Experiments and modelling of a draft tube airlift reactor operated at high gas throughputs. (2013) Chemical Engineering Science, 104. 32-43. ISSN 0009-2509

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Official URL: http://dx.doi.org/10.1016/j.ces.2013.08.044

Abstract

One-dimensional modelling of global hydrodynamics and mass transfer is developed for an annulus sparged draft tube airlift reactor operating at high gas throughputs. In a first part, a specific closure law for the mean slip velocity of bubbles in the riser is proposed according for, in one hand, the collective effects on bubble rise velocity and, in the other hand, the size of the liquid recirculation in the airlift riser. This global hydrodynamics model is found towel explain the global gas volume fraction measurements in the airlift riser for a wide range of superficial gas velocity (0.6 ≤ Jg ≥10 cm sˉ¹). In a second part, mass transfer in the airlift has been studied by using the gassing-out method and a dual-tip optical probe to measure the bubble size distributions. As for bubble columns, in such airlift, the volumetric mass transfer coefficient appears to be quite proportional to the gas superficial velocity. Finally, as in Colombet et al. (2011), mass transfer at the bubble scale seems to be weakly influenced by an increase of gas volume fraction.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The original publication is available at http://www.sciencedirect.com
HAL Id:hal-00919671
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Other partners > Rhodia (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Laboratory name:
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Deposited By: Dominique LEGENDRE
Deposited On:17 Dec 2013 09:53

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