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Research Papers

Induced-Charge Electroosmosis Around Touching Metal Rods

[+] Author and Article Information
Ali Beskok

e-mail: abeskok@odu.edu
Institute of Micro and Nanotechnology,
Old Dominion University,
Norfolk, VA 23529

1Corresponding author.

Manuscript received August 14, 2012; final manuscript received October 19, 2012; published online March 19, 2013. Assoc. Editor: Kendra Sharp.

J. Fluids Eng 135(2), 021103 (Mar 19, 2013) (10 pages) Paper No: FE-12-1391; doi: 10.1115/1.4023452 History: Received August 14, 2012; Revised October 19, 2012

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.

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Figures

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Fig. 1

Experimental setup showing (a) key dimensions, (b) channel arrangement, (c) background-subtracted micro-PIV image, (d) particle streak lines

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Fig. 2

Patterns of ensemble-averaged flow fields of inline configuration for 200Vp-p, 300Vp-p, and 400Vp-p with ac frequency of 500Hz, 800Hz, 1 kHz, 1.1 kHz, and 1.5 kHz. ϕ is the diameter of the rod.

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Fig. 3

Patterns of ensemble-averaged flow fields of triangle configuration for 200Vp-p, 300Vp-p, and 400Vp-p with ac frequency of 500Hz, 800Hz, 1 kHz, 1.1 kHz, and 1.5 kHz. ϕ is the diameter of the rod.

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Fig. 4

Flow field and streamlines showing ICEO flow simulations around two configurations

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Fig. 5

Voltage dependence of the velocity magnitudes along GL1 (inline)

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Fig. 6

Voltage dependence of the velocity magnitudes along GL2 (triangle)

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Fig. 7

Frequency dependence of the velocity magnitudes along GL1 (inline) and GL2 (triangle)

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Fig. 8

Variations of the tangential velocity magnitudes along the lines (GL3) between the centers of vortices and center of one of inline rods at various ac electric field strengths

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Fig. 9

Variations of the tangential velocity magnitudes along the lines (GL3) between the centers of vortices and center of one of inline rod at various ad electric field frequencies

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Fig. 10

Variations of the left and right averaged maximum velocity magnitudes along GL1 as a function of Vp-p2

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Fig. 11

Comparison of experimental and numerical velocity (200 Vp-p and 500 Hz) variations along a line between the rod surface and vortex center, due to mismatch between the experimental and numerical results ordinate is drawn using arbitrary units (A.U.)

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