Induced-charge electroosmosis (ICEO) around multiple gold-coated stainless steel rods under different ac electric fields is analyzed using microparticle image velocimetry (micro-PIV) and numerical simulations. In the present investigation, the induced electric double layer (EDL) is in weakly nonlinear limit. The ICEO flow around multiple touching rods exhibits geometry dependent quadrupolar flow structures with four vortices. The velocity magnitude is proportional to the square of the electric field. The ICEO flow velocity also depends on the cylinder orientation. The velocity increases with increased radial distance from the rod’s surface, attains a maximum, and then decays to zero. Experimental and numerical velocity distributions have the same trend beyond 0.2 mm of the rod’s surface.
Induced-Charge Electroosmosis Around Touching Metal Rods
Manuscript received August 14, 2012; final manuscript received October 19, 2012; published online March 19, 2013. Assoc. Editor: Kendra Sharp.
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Canpolat, C., Zhang, M., Rosen, W., Qian, S., and Beskok, A. (March 19, 2013). "Induced-Charge Electroosmosis Around Touching Metal Rods." ASME. J. Fluids Eng. February 2013; 135(2): 021103. https://doi.org/10.1115/1.4023452
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