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Issue 6, 2008
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Quantification of electrical field-induced flow reversal in a microchannel

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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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Publication details

The article was received on 18 Feb 2008, accepted on 19 Mar 2008 and first published on 17 Apr 2008


Article type: Paper
DOI: 10.1039/B802800A
Citation: 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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