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 Electrically-Excited Flows in Microchannels for Mixing Application

Authors: I. Meisel and P. Ehrhard

Affilation: Forschungszentrum Karlsruhe GmbH., Germany

Pages: 62 - 65

Keywords: electrical double layer, electrohydrodynamics, microchannel, microflow, micromixer, vortex street

In the present paper we propose a method for improved mixing in microchannels. The basic idea is to excite a secondary vortex flow around an obstacle within the micromixer by applying an external oscillatory electrical field. For a simple setup with a single cylindrical obstacle our numerical (FEM) simulations demonstrate the potential of this method. We find that mixing is improved due to an enlargement of the "interfacial" area between the liquids. Further, a dimensionless quantitative measure for the increase of the "interfacial" area is proposed.

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