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Hydrodynamic study and optimization of the geometry of a wavy channel in an intensified heat exchanger/reactor

Anxionnaz, Zoé and Cabassud, Michel and Gourdon, Christophe and Tochon, Patrice Hydrodynamic study and optimization of the geometry of a wavy channel in an intensified heat exchanger/reactor. (2009) In: 2nd International Congress on Green Process Engineering,2nd European Process Intensification Conference, 14-17 June 2009, Venise,Italie .

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Abstract

The implementation of chemical syntheses in batch or semi-batch reactor is generally limited by the removal or the supply of heat. A way to enhance thermal performances is to develop multifunctional devices like heat exchanger/reactors. Then, to improve yields, selectivity and safety in such apparatuses, mass transfer has to be enhanced. One of the interesting ways to intensify the mass transfer is to structure the wavy channel etched on each plate. A plate-type heat exchanger/reactor has been studied in this work. The influence of the geometrical parameters (corrugation angle, aspect ratio, curvature radius and straight length) of the etched wavy channel on residence time distribution (RTD), mixing performances and pressure drop has been experimentally investigated. Five geometries have been tested and a mock-up has been designed and built for each one. It was shown that reducing the curvature radius (from 4 to 1.5mm) is interesting to promote the mass transfer (development of Dean vortices) with a moderate increase of the pressure drop for low Reynolds numbers. The increase of the straight length (from 7 to 20mm) allows a decrease of the pressure drop without any significant effect on the mixing performance. Moreover, it was shown that increasing the aspect ratio from 0.5 (rectangular cross section) to 1 (square cross section) has a negative impact on the RTD but enhances the mass transfer. Finally, the corrugation angle seems not to have any effect on mass transfer, RTD and pressure drop. Keywords. Heat exchanger/reactor, wavy channel, mass transfer, Dean instabilities, intensification.

Item Type:Conference or Workshop Item (Speech)
Additional Information:This article is publied in the CDrom : Proceedings 14-17 June 2009, Venice-Italy.
Audience (conference):International conference proceedings
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Guylène Abadie

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