Capillary Stokes drift: a new driving mechanism for mixing in AC-electrowetting.

  title={Capillary Stokes drift: a new driving mechanism for mixing in AC-electrowetting.},
  author={Frieder Mugele and Adrian Staicu and Rina Bakker and Dirk van den Ende},
  journal={Lab on a chip},
  volume={11 12},
We studied the flow fields generated inside sessile drops that oscillate periodically between states of high and low contact angle under the influence of alternating electric fields of variable frequency and amplitude. Following the motion of dye patches, we show that the number of oscillation cycles required to achieve mixing scales logarithmically with the Péclet number as expected for chaotic mixing. High speed movies reveal an asymmetry of the drop shape between the spreading and receding… CONTINUE READING

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