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

Research output: Contribution to journalArticleAcademicpeer-review

5 Citations (Scopus)


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 languageEnglish
Pages (from-to)945-949
Number of pages5
JournalLab on a chip
Issue number6
Publication statusPublished - Apr 2008


  • METIS-247752
  • EWI-13016
  • IR-62377


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