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Gas-liquid mass transfer around Taylor bubbles flowing in a long, in-plane,spiral-shaped milli-reactor

Mei, Mei and Hebrard, Gilles and Dietrich, Nicolas and Loubière, Karine Gas-liquid mass transfer around Taylor bubbles flowing in a long, in-plane,spiral-shaped milli-reactor. (2020) Chemical Engineering Science, 222. 1-13. ISSN 0009-2509

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Official URL: https://doi.org/10.1016/j.ces.2020.115717

Abstract

Gas–liquid mass transfer was investigated around Taylor bubbles flowing in a long, in-plane, spiralshaped milli-reactor involving various configurations. Using a colorimetric technique and image posttreatment, the variation of the equivalent O2 concentration inside the liquid slugs was measured. The coloration positions, corresponding to 99% of the maximum concentration reached in the liquid slug, changed significantly under various operating conditions. Overall volumetric mass transfer coefficients were evaluated on the basis of these coloration positions, without considering the hydrodynamics change. The intensification factor of two configurations was found to be proportional to the increase in Dean number. Considering the changes in pressure drop, bubble length and velocity, the axial variation of cumulated mass flux could be measured. It decreased along tube and finally tended towards a constant value. A scaling law for the Sherwood number was proposed by introducing a normalized time, dimensionless liquid slug length, and the Péclet and Dean numbers.

Item Type:Article
HAL Id:hal-02543386
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 - Toulouse INP (FRANCE)
French research institutions > Institut National de la Recherche Agronomique - INRA (FRANCE)
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:16 Oct 2020 11:56

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