We report a free-surface electrohydrodynamic flow phenomenon driven by an ionic wind mechanism induced by a high frequency gas-phase ac field . Intense vortices are generated above a critical voltage, beyond which the vortices break down to spawn off new vortex pairs leading to a cascade of vortices over a continuum of length scales; the mixing efficiency approaches a turbulent-like state. Colloidal particles are attracted and aggregated into planar crystal structures within the vortices by a combination of dielectrophoresis and shear-induced diffusion.
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Research Article| June 08 2006
Electrohydrodynamic surface microvortices for mixing and particle trapping
Leslie Y. Yeo;
Leslie Y. Yeo, Diana Hou, Siddharth Maheshswari, Hsueh-Chia Chang; Electrohydrodynamic surface microvortices for mixing and particle trapping. Appl. Phys. Lett. 5 June 2006; 88 (23): 233512. https://doi.org/10.1063/1.2212275
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