Electrokinetic/Electrohydrodynamic Flow Instability

Electrokinetic/Electrohydrodynamic Flow Instability, Fig. 1 Left) Imaged particle paths for 0.49 pm-diameter fluorescent particles. The image intensity scale is inverted to better visualize the particle paths, (a) Stable oscillations at 1 kV. (b) Particles oscillate in plane with a transverse component at a larger applied voltage of 4 kV. 

Electrokinetic/Electrohydrodynamic Flow Instability, Fig. 3 Eiectrohydrodynamic mixing in a DC electric field. The images show the outlet branch of the microchannel after the device has been loaded with two fluids, (a) The initial condition showing a dark green fluid... 

Electrokinetic/Electrohydrodynamic Flow Instability, Fig. 5 (a) Schematic of the three-inlet geometry with electrodes and instability mixing. The channel height is 30 (tm, and the electrode to electrode spacing is 75 pm. (b) A stable flow in the absence of an electric field, (c) The disruption of flow after a 41 Vrms potential (initial applied field Eo = 8.2-10 V/m) is applied at 250 kHz to the electrodes, (d) EHD instability at 44 Vr s (initial applied field Eo = 8.8-10 V/m), 700 KHz. (e) Dispersion of the... 

Electrokinetic/ElectroHydrodynamic Flow Instability, Rgure 4 Plot of the negative imaginary (unstabie) roots of a> versus wavenumber using the viscous anaiysis for a variety of appiied fieids. The fiow is unstable as long as the root is negative imaginary [9]... 

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