Fluid flow and mixing within drops in AC electrowetting

P. García-Sánchez*, A. Ramos, F. Mugele

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

Electrowetting generates flow patterns inside drops when AC voltages are employed. For AC frequencies around the drop eigenfrequency (typically O(1kHz) or less), capillary waves emanate from the contact line giving rise to a net motion in the bulk of the drop. This flow can be described by a capillary wave-driven Stokes drift. At higher AC frequencies (above 10kHz, depending on liquid conductivity) electrical currents generate nonuniform Joule heating, giving rise to temperature gradients and, consequently, gradients in conductivity and permittivity. We show how the electric field acting on these gradients can generate fluid flow (Electrothermally induced flows).

Original languageEnglish
Title of host publication14th International Conference on Miniaturized Systems for Chemistry and Life Sciences 2010, MicroTAS 2010
Pages2101-2103
Number of pages3
Volume3
Publication statusPublished - 1 Dec 2010
Event14th International Conference on Miniaturized Systems for Chemistry and Life Sciences, µTAS 2010 - Groningen, Netherlands
Duration: 3 Oct 20107 Oct 2010
Conference number: 14

Conference

Conference14th International Conference on Miniaturized Systems for Chemistry and Life Sciences, µTAS 2010
Abbreviated titleMicroTAS 2010
CountryNetherlands
CityGroningen
Period3/10/107/10/10

Keywords

  • Electrothermal flows
  • Electrowetting
  • Microfluidics
  • Mixing

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