Nanotech 2002 Vol. 1
Nanotech 2002 Vol. 1
Technical Proceedings of the 2002 International Conference on Modeling and Simulation of Microsystems

Micro and Nano Fluidic Systems Chapter 2

Simulation of Hydrodynamic Dispersion in Gas/Liquid Microreactors

Authors: S. Hardt, F. Doffing and H. Pennemann

Affilation: Institut für Mikrotechnik Mainz Gmbh, Germany

Pages: 54 - 57

Keywords: microreactors, hydrodynamic dispersion, computational fluid dynamics, volume-of-fluid method

Abstract:
Dispersion and spreading of concentration signals in gas/liquid microreactors is studied with methods of computational fluid dynamics (CFD). It is shown that conventional reactor designs exhibit a broad residence-time distribution due to convective signal dispersion. This result is supported by experiments monitoring the transport of a liquid plug introduced into the microreactor by a micro-dispenser. A new reactor design is proposed which exhibits a more favorable velocity profile by guiding the liquid stream over alternating platelets. With simulations based on the volume-of-fluid (VOF) method it is shown that a thin, continuous liquid film forms inside the reactor. Subsequently, the transport of concentration fields described by a convection-diffusion equation is studied. It is found that, due to the approximate plug-flow character of fluid motion within this film, concentration signals experience significantly lower dispersion than in the conventional design. The new reactor design will provide the basis of a new class of gas/liquid microreactors to be developed at the Institute of Microtechnology Mainz.


ISBN: 0-9708275-7-1
Pages: 764

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