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Electrohydrodynamic surface microvortices for mixing and particle trapping

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4 Author(s)
Yeo, Leslie Y. ; Micro/Nanophysics Research Laboratory Department of Mechanical Engineering, Monash University, Clayton, Victoria 3800, Australia ; Hou, Diana ; Maheshswari, Siddharth ; Chang, Hsueh-Chia

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We report a free-surface electrohydrodynamic flow phenomenon driven by an ionic wind mechanism induced by a high frequency gas-phase ac field (≫10 kHz). Intense vortices ≫1 cm/s 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.

Published in:

Applied Physics Letters  (Volume:88 ,  Issue: 23 )

Date of Publication:

Jun 2006

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