Nano Science and Technology Institute
MSM 2000
MSM 2000
Technical Proceedings of the 2000 International Conference on Modeling and Simulation of Microsystems
Chapter 15: Applications: Micropumps, Heaters and Coolers

Simulation of Heat-Transfer Enhancement Effects in Microreactors

Authors:S. Hardt, W. Ehrfeld, V. Hessel and K.M. Vanden Bussche
Affilation:Institut für Mikrotechnik Mainz GmbH, DE
Pages:644 - 647
Keywords:microreactors, microstructuring techniques, heat transfer enhancement, computational fluid dynamics
Abstract:Sate-of-the-art microstructuring techniques allow to model the interface for heat and mass transfer in miniaturized reactions systems on a micrometer scale. In this context, two different approaches for heat transfer enhancement are presented. The ideas put forward rely on entrance flow effects and inertial flows in meandering channels, respectively. It is found that a heat transfer enhancement of at least one order of magnitude can be achieved compared to unstructured channels. On this basis, a miniaturized heat-exchanger reaction system is investigated, where a kinetic model of an endothermic, heterogeneously catalyzed gas-phase reaction is used. The miniaturized heat-exchanger reactor, both with and without heat transfer enhancement, is subsequently benchmarked against conventional fixed bed technology. It is shown that, for the reaction system under study, a substantial reduction of the required amount of catalyst can be achieved in microsystems.
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