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Electrohydrodynamic surface microvortices for mixing and particle trapping
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) (a) Schematic illustration of the experiment. (b) Flow visualization with smoke particles; smoke particles rise by buoyancy from a source below the point electrode below the critical voltage (left panel) but are deflected downwards by the ionic wind beyond it (right panel). (c) Flow circulation behavior as a function of the applied voltage and frequency. (d) Dominant vortex pair at (0 to peak) and . (e) Breakdown of the primary vortex at (0 to peak) and to form a secondary vortex. (f) Vortex breakdown at (0 to peak) and in which three secondary vortices are generated from the primary vortex.

Image of FIG. 2.
FIG. 2.

(Color online) (a) Successive images in time capturing the micromixing action of red food dye in water induced by electrokinetic interfacial shear. (b) Particulate aggregation in the vortex streamlines due to DEP force and shear-induced migration. (c) Particle aggregation is observed to remain intact after removal of the electric field and cessation of the flow.

Image of FIG. 3.
FIG. 3.

(Color online) (a) Change in instantaneous vortex particle volume fraction with the ratio between the DEP and shear-induced migration velocities for a suspension of polystyrene particles in DI water. The open data points represent events concentrated particles are on the periphery forming a concentrated ring, whereas the solid data points represent events in which particle invasion into the vortex interior occurred. (b) Particle convective velocity as a function of for a suspension of polystyrene particles in DI water, indicating good agreement with the correlation of Ref. 10.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Electrohydrodynamic surface microvortices for mixing and particle trapping