Issue 6, 2008
From the journal:

Lab on a Chip

Quantification of electrical field-induced flow reversal in a microchannel

C. Pirat,†*a   A. Naso,†a   E. J. van der Wouden,b   J. G. E. Gardeniers,b   D. Lohsea  and  A. van den Bergb  

* Corresponding authors

a Physics of Fluids Group, Department of Applied Physics, University of Twente, P.O. Box 217, Enschede, The Netherlands
E-mail: d.lohse@tnw.utwente.nl

b BIOS Lab-on-a-Chip Group, MESA+ Research Institute for Nanotechnology, University of Twente, P.O. Box 217, Enschede, The Netherlands
E-mail: a.vandenberg@ewi.utwente.nl

Abstract

We characterize the electroosmotic flow in a microchannel with field effect flow control. High resolution measurements of the flow velocity, performed by micro particle image velocimetry, evidence the flow reversal induced by a local modification of the surface charge due to the presence of the gate. The shape of the microchannel cross-section is accurately extracted from these measurements. Experimental velocity profiles show a quantitative agreement with numerical results accounting for this exact shape. Analytical predictions assuming a rectangular cross-section are found to give a reasonable estimate of the velocity far enough from the walls.

Graphical abstract: Quantification of electrical field-induced flow reversal in a microchannel

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Article information

DOI
https://doi.org/10.1039/B802800A
Article type
Paper
Submitted
18 Feb 2008
Accepted
19 Mar 2008
First published
17 Apr 2008

Lab Chip, 2008,8, 945-949

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Quantification of electrical field-induced flow reversal in a microchannel

C. Pirat, A. Naso, E. J. van der Wouden, J. G. E. Gardeniers, D. Lohse and A. van den Berg, Lab Chip, 2008, 8, 945 DOI: 10.1039/B802800A

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