Quantification of electrical field-induced flow reversal in a microchannel


Pirat, C. and Naso, A. and Wouden, E.J. van der and Gardeniers, J.G.E. and Lohse, D. and Berg, A. van den (2008) Quantification of electrical field-induced flow reversal in a microchannel. Lab on a Chip, 8 (6). pp. 945-949. ISSN 1473-0197

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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.
Item Type:Article
Copyright:© 2008 Royal Society of Chemistry
Electrical Engineering, Mathematics and Computer Science (EEMCS)
Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/62377
Official URL:https://doi.org/10.1039/b802800a
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