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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Waghmare, P. R., and Mitra, S. K., 2008, “Investigation of Combined Electro-Osmotic and Pressure-Driven Flow in Rough Microchannels,” ASME J. Fluids Eng., 130(6), p. 061204. [CrossRef]
Levitan, J. A., Devasenathipathy, S., Studer, V., Ben, Y., Thorsen, T., Squires, T. M., and Bazant, M. Z., 2005, “Experimental Observation of Induced-Charge Electro-Osmosis Around a Metal Wire in a Microchannel,” Colloid. Surface. A, 267, pp. 122–132. [CrossRef]
Squires, T. M., and Bazant, M. Z., 2006, “Breaking Symmetries in Induced-Charge Electro-Osmosis and Electrophoresis,” J. Fluid Mech., 560, pp. 65–101. [CrossRef]
Zhao, H., and Bau, H. H., 2007, “Microfluidic Chaotic Stirrer Utilizing Induced-Charge Electro-Osmosis,” Phys. Rev. E, 75, p. 066217. [CrossRef]
Harnett, C. K., Templeton, J., Dunphy-Guzman, K. A., Senousy, Y. M., and Kanouff, M. P., 2008, “Model Based Design of a Microfluidic Mixer Driven by Induced Charge Electroosmosis,” Lab Chip, 8, pp. 565–572. [CrossRef] [PubMed]
Wang, Y., Zhe, J., Dutta, P., and Chung, B. T., 2007, “A Microfluidic Mixer Utilizing Electrokinetic Relay Switching and Asymmetric Flow Geometries,” ASME J. Fluids Eng., 129(4), pp. 395–403. [CrossRef]
Sanchez, P. G., Ramos, A., Gonzales, A., Green, N. G., and Morgan, H., 2009, “Flow Reversal in Travelling-Wave Electrokinetics: An Analysis of Forces,” Langmuir, 25(9), pp. 4988–4997. [CrossRef] [PubMed]
Yalcin, S. E., Sharma, A., Qian, S., Joo, S. W., and Baysal, O., 2010, “Manipulating Particles in Microfluidics by Floating Electrodes,” Electrophoresis, 31, pp. 3711–3718. [CrossRef] [PubMed]
Yalcin, S. E., Sharma, A., Qian, S., Joo, S.W., and Baysal, O., 2011, “On-Demand Particle Enrichment in a Microfluidic Channel by a Locally Controlled Floating Electrode,” Sensor. Actuat. B Chem., 153, pp. 277–283. [CrossRef]
Hunter, R. J., 1981, Zeta Potential in Colloid Science: Principles and Applications, Academic Press Inc., NewYork.
Squires, T. M., and Bazant, M. Z., 2004, “Induced-Charge Electro-Osmosis,” J. Fluid Mech., 509, pp. 217–252. [CrossRef]
Gamayunov, N. I., Mantrov, G. I., and Murtsovkin, V. A., 1992, “Study of Flows Induced in the Vicinity of Conducting Particles by an External Electric-Field,” Colloid J. USSR, 54, pp. 20–23.
Dukhin, S. S., 1993, “Non-Equilibrium Electric Surface Phenomena,” Adv. Colloid Interfac., 44, pp. 1–134. [CrossRef]
Murtsovkin, V. A., 1996, “Nonlinear Flows Near Polarized Disperse Particles,” Colloid J., 58, pp. 341–349.
Squires, T. M., 2009, “Induced-Charge Electrokinetics: Fundamental Challenges and Opportunities,” Lab Chip, 9, pp. 2477–2483. [CrossRef] [PubMed]
Bazant, M. Z., Kilic, M. S., Storey, B. D., and Ajdari, A., 2009, “Towards an Understanding of Induced-Charge Electrokinetics at Large Applied Voltages in Concentrated Solution,” Adv. Colloid Interfac., 152, pp. 48–88. [CrossRef]
Bazant, M., and Squires, T. M., 2010, “Induced-Charge Electrokinetic Phenomena,” Curr. Opin. Colloid In., 15, pp. 203–213. [CrossRef]
Mansuripur, T., Pascall, A. J., and Squires, T. M., 2009, “Asymmetric Flows Over Symmetric Surfaces: Capacitive Coupling in Induced-Charge Electro-Osmosis,” New J. Phys., 11, p. 075030. [CrossRef]
Canpolat, C., Qian, S., and Beskok, A., 2013 “Micro-PIV Measurements of Induced-Charge Electro-Osmosis Around a Metal Rod,” Microfluid. Nanofluid., 14(1–2), pp. 153–162. [CrossRef]
Sharp, K. V., Yazdi, S. H., and Davison, S., 2011, “Localized Flow Control in Microchannel Using Induced-Charge Electroosmosis Near Conductive Obstacles,” Microfluid. Nanofluid., 10, pp. 1257–1267. [CrossRef]
Duffy, D. C., McDonald, J. C., Schueller, O. J. A., and Whitesides, G. M., 1998, “Rapid Prototyping of Microfluidic Systems in Poly(dimethylsiloxane),” Anal. Chem., 70, pp. 4974–4984. [CrossRef] [PubMed]
González, A., Ramos, A., Green, N. G., Castellanos, A., and Morgan, H., 2000, “Fluid Flow Induced by Nonuniform ac Electric Fields in Electrolytes on Microelectrodes. II. A Linear Double-Layer Analysis,” Phys. Rev. E, 61, pp. 4019–4028. [CrossRef]
Zhang, M., Ai, Y., Sharma, A., Joo, S. W., Kim, D. S., and Qian, S., 2011, “Electrokinetic Particle Translocation Through a Nanopore Containing a Floating Electrode,” Electrophoresis, 32(14), pp. 1864–1874. [CrossRef] [PubMed]
Morgan, H., and Green, N. G., 2003, AC Electrokinetics: Colloids and Nanoparticles, Research Studies Press Ltd., Philadelphia.
Chang, H. S., and Yeo, L. Y., 2010, Electrokinetically Driven Microfluidics and Nanofluidics, Cambridge University Press, New York.
Li, H., and Olsen, M. G., 2006, “Aspect Ratio Effects on Turbulent and Transitional Flow in Rectangular Microchannels as Measured With MicroPIV,” ASME J. Fluids Eng., 128(2), pp. 305–315. [CrossRef]
Kim, M. J., Beskok, A., and Kihm, K. D., 2002, “Electro-Osmosis-Driven Micro-Channel Flows: A Comparative Study of Microscopic Particle Image Velocimetry Measurements and Numerical Simulations,” Exper. Fluids, 33, pp. 170–180. [CrossRef]
Ai, Y., Joo, S. W., Jiang, Y., Xuan, X., and Qian, S., 2009, “Transient Electrophoretic Motion of a Charged Particle Through a Converging-Diverging Microchannel: Effect of Direct Current Dielectrophoretic Force,” Electrophoresis, 30, pp. 2499–2506. [CrossRef] [PubMed]
Ai, Y., Park, S., Zhu, J., Xuan, X., Beskok, A., and Qian, S., 2010, “DC Electrokinetic Particle Transport in an L-Shaped Microchannel,” Langmuir, 26(4), pp. 2937–2944. [CrossRef] [PubMed]
Williams, S. J., Chamarthy, P., and Wereley, S. T., 2010, “Comparison of Experiments and Simulation of Joule Heating in ac Electrokinetic Chips,” ASME J. Fluids Eng., 132(2), p. 021103. [CrossRef]
Park, S., Koklu, M., and Beskok, A., 2009, “Particle Trapping in High-Conductivity Media With Electrothermally Enhanced Negative Dielectrophoresis,” Anal. Chem., 81(6), pp. 2303–2310. [CrossRef] [PubMed]
Wang, D., Sigurdson, M., and Meinhart, C. D., 2005, “Experimental Analysis of Particle and Fluid Motion in ac Electrokinetics,” Exper. Fluids, 38, pp. 1–10. [CrossRef]
Studer, V., Pépin, A., Chen, Y., and Ajdari, A., 2004, “An Integrated ac Electrokinetic Pump in a Microfluidic Loop for Fast Tunable Flow Control,” Analyst, 129, pp. 944–949. [CrossRef] [PubMed]
Storey, B. D., Edwards, L. R., Kilic, M. S., and Bazant, M. Z., 2008, “Steric Effects on ac Electro-Osmosis in Dilute Electrolytes,” Phys. Rev. E, 77, p. 036317. [CrossRef]


Grahic Jump Location
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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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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