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; A. van den Berg

doi:10.1039/b802800a

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, A. van den Berg

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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.

Original language	English
Pages (from-to)	945-949
Number of pages	5
Journal	Lab on a chip
Volume	8
Issue number	6
DOIs	https://doi.org/10.1039/b802800a
Publication status	Published - Apr 2008

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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.",

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AU - Pirat, C.

AU - Naso, A.

AU - van der Wouden, E.J.

AU - Gardeniers, J.G.E.

AU - Lohse, D.

AU - van den Berg, A.

PY - 2008/4

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N2 - 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.

AB - 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.

U2 - 10.1039/b802800a

DO - 10.1039/b802800a

M3 - Article

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VL - 8

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JO - Lab on a chip

JF - Lab on a chip

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Quantification of electrical field-induced flow reversal in a microchannel

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