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Received January 17, 2005
Accepted June 9, 2005
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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The Electrokinetic Microfluidic Flow in Multi-Channels with Emergent Applicability Toward Micro Power Generation
Complex Fluids Research Laboratory, Korea Institute of Science and Technology (KIST), PO Box 131, Cheongryang, Seoul 130-650, Korea 1Environment and Process Technology Div., Korea Institute of Science and Technology (KIST), PO Box 131, Cheongryang, Seoul 130-650, Korea
mschun@kist.re.kr
Korean Journal of Chemical Engineering, July 2005, 22(4), 528-535(8), 10.1007/BF02706637
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Abstract
In order to elaborate the possible applicability of microfluidic power generation from conceptualization to system validation, we adopt a theoretical model of the electrokinetic streaming potential previously developed for the single channel problem. The ion transport in the microchannel is described on the basis of the Nernst-Planck equation, and a monovalent symmetric electrolyte of LiClO4 is considered. Simulation results provide that the flow-induced streaming potential increases with increasing the surface potential of the microchannel wall as well as decreasing the surface conductivity. The streaming potential is also changed with variations of the electric double layer thickness normalized by the channel radius. From the electric circuit model with an array of microchannels, it is of interest to evaluate that a higher surface potential leads to increasing the power density as well as the energy density. Both the power density and the conversion efficiency tend to enhance with increasing either external resistance or number of channels. If a single microchannel is assembled in parallel with the order of 103, the power density of the system employing large external resistance is estimated to be above 1W/m3 even at low pressure difference less than 1 bar.
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References
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Chun MS, Lee SY, Yang SM, J. Colloid Interface Sci., 266(1), 120 (2003)
Chun MS, Lee TS, Choi NW, J. Micromech. Microeng., 15, 710 (2005)
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Karniadakis GE, Beskok A, Micro Flows: Fundamentals and Simulation, Springer-Verlag Inc., New York (2003)
Koeneman PB, Busch-Vishniac JJ, Wood KL, J. Microelectromech. Syst., 6, 355 (1997)
Levine S, Marriott JR, Neale G, Epstein N, J. Colloid Interface Sci., 52, 136 (1975)
Polson NA, Hayes MA, Anal. Chem., 72, 1088 (2000)
Probstein RF, Physicochemical Hydrodynamics, Wiley and Sons, New York (1994)
Ren LQ, Li DQ, Qu WL, J. Colloid Interface Sci., 233(1), 12 (2001)
Rice CL, Whitehead R, J. Phys. Chem., 69, 4017 (1965)
Sung JH, Chun MS, Choi HJ, J. Colloid Interface Sci., 264(1), 195 (2003)
Szymczyk A, Aoubiza B, Fievet P, Pagetti J, J. Colloid Interface Sci., 216(2), 285 (1999)
Vainshtein P, Gutfinger C, J. Micromech. Microeng., 12, 252 (2002)
Werner C, Korber H, Zimmermann R, Dukhin S, Jacobasch HJ, J. Colloid Interface Sci., 208(1), 329 (1998)
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Yang J, Kwok DY, J. Micromech. Microeng., 13, 115 (2003)
Yang J, Lu F, Kostiuk LW, Kwok DY, J. Micromech. Microeng., 13, 963 (2003)
