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Hydrodynamic study of a monolith-type reactor for intensification of gas-liquid applications

Devatine, Audrey and Chaumat, Hélène and Guillaume, Simon and Tati Tchibouanga, Bismath and Durán Martínez, Freddy and Julcour-Lebigue, Carine and Billet, Anne-Marie Hydrodynamic study of a monolith-type reactor for intensification of gas-liquid applications. (2017) Chemical Engineering and Processing, 122. 277-287. ISSN 0255-2701

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Official URL: https://doi.org/10.1016/j.cep.2017.10.015

Abstract

Two-phase monolith-type reactors allow intensified heat and mass transfer rates, but often suffer from fluid maldistribution and undesired flow regimes in channels. A cold-flow monolith reactor (0.1 m diameter, 84 channels) is used here to assess liquid distribution and flow regimes at various air and water velocities: resistive probes give an insight of the flow patterns within 5 representative channels located at different radial positions, showing that regime transition to Taylor flow occurs in these channels simultaneously at lower gas and liquid superficial velocities than predicted by single capillary studies (namely uL and uG < 0.1 m s−1). nA full mapping of the partial liquid flow rates in the monolith channels is derived by a gravimetric method via specifically designed collectors. In the identified Taylor flow domain, liquid distribution exhibits a W-shaped profile with marked peaks at low liquid velocity (uL = 0.04 m s−1). Increasing the liquid flow rate significantly (uL = 0.1 m s−1) smooths liquid distribution, reducing the maldistribution factor by half. Gas velocity also helps phase uniformity but to a smaller extent. It is estimated that even higher fluid velocities (at least tripled) would be required to feed all channels equally. Adding stack of distribution plates of variable cell density at the top of the monolith does not enhance the quality of the liquid distribution, except at low liquid velocity.

Item Type:Article
HAL Id:hal-01882029
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)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Loetitia MOYA
Deposited On:26 Sep 2018 13:05

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