Browse > Article

Unsteady Electroosmotic Channel Flows with the Nonoverlapped and Overlapped Electric Double Layers  

Kang, Sang-Mo (Department of Mechanical Engineering, Dong-A University)
Suh, Yong-Kweon (Department of Mechanical Engineering, Dong-A University)
Publication Information
Journal of Mechanical Science and Technology / v.20, no.12, 2006 , pp. 2250-2264 More about this Journal
Abstract
In micro- and nanoflows, the Boltzmann distribution is valid only when the electric double layers (EDL's) are not overlapped and the ionic distributions establish an equilibrium state. The present study has numerically investigated unsteady two-dimensional fully-developed electroosmotic flows between two parallel flat plates in the nonoverlapped and overlapped EDL cases, without any assumption of the Boltzmann distribution. For the study, two kinds of unsteady flows are considered: one is the impulsive application of a constant electric field and the other is the application of a sinusoidally oscillating electric field. For the numerical simulations, the ionic-species and electric-field equations as well as the continuity and momentum ones are solved. Numerical simulations are successful in accurately predicting unsteady electroosmotic flows and ionic distributions. Results show that the nonoverlapped and overlapped cases are totally different in their basic characteristics. This study would contribute to further understanding unsteady electroosmotic flows in micro- and nanofluidic devices.
Keywords
Electric Double Layer (EDL); Unsteady Electroosmotic Flow; Oscillating Electric Field; Overlapped EDL;
Citations & Related Records

Times Cited By Web Of Science : 5  (Related Records In Web of Science)
Times Cited By SCOPUS : 5
연도 인용수 순위
1 Qu, W. and Li, D., 2000, 'A Model for Over？lapped EDL Fields,' Journal of Colloid and Interface Science, Vol. 224, pp. 397-407   DOI   ScienceOn
2 Soderman, O. and Jonsson, B., 1996, 'Electroosmosis: Velocity Profiles in Different Geometries with Both Temporal and Spatial Resolution,' Journal of Chemical Physics, Vol. 105, ？pp. 1030-0311   DOI
3 Stone, H. A., Stroock, A. D. and Ajdari, A., 2004, 'Engineering Flows in Small Devices: Microfluidics toward a Lab-on-a-Chip,' Annu·al Review of Fluid Mechanics, Vol. 36, pp. 381-411   DOI   ScienceOn
4 ？Currie, I. G., 1974, Fundamental Mechanics of Fluids, McGraw-Hill, New York
5 Dose, E. V. and Guiochon, G., 1993, 'Timescales of Transient Processes in Capillary Electrophoresis,' Journal of Chromatography A, Vol. 652, pp. 263-275   DOI   ScienceOn
6 Dutta, P. and Beskok, A., 2001, 'Analytical Solution of Time Periodic Electroosmotic Flows: Analogies to Stokes' Second Problem,' Analytical Chemistry, Vol. 73, pp. 5097-5102   DOI   ScienceOn
7 Erickson, D. and Li, D., 2003, 'Analysis of Alternating Current Electroosmotic Flows in a Rectangular Microchannel,' Langmuir, Vol. 19, pp. 5421- 5430   DOI   ScienceOn
8 Hu, L., Harrison, J. D., and Masliyah, J. H., 1999, 'Numerical Model of Electrokinetic Flow for Capillary Electrophoresis,' Journal of Colloid and Interface Science, Vol. 215, pp. 300-312   DOI   ScienceOn
9 Kwak, H. S. and Hasselbrink Jr., E. F., 2005, 'Timescales for Relaxation to Boltzmann Equilibrium in Nanopores,' Journal of Colloid and Interface Science, Vol. 284, pp. 753-758   DOI   ScienceOn
10 Li, D., 2004, Electrokinetics in Microfluidics, Elsevier, London
11 Lin, H., Storey, B. D., Oddy, M. H., Chen, C. -H. and Santiago, J. G., 2004, 'Instability of Electrokinetic Microchannel Flows with Conductivity Gradients,' Physics of Fluids, Vol. 16, pp. 1922-1935   DOI   ScienceOn
12 Oddy, M. H., Santiago, J. G. and Mikkelsen, J. C., 2001, 'Electrokinetic Instability Micromixing,' Analytical Chemistry, Vol. 73, pp.5822-5832   DOI   ScienceOn
13 Qian, S. and Bau, H. H., 2005, 'Theoretical Investigation of Electro-osmotic Flows and Chaotic Stirring in Rectangular Cavities,' Applied Mathematical Modelling, Vol. 29, pp.726-753   DOI   ScienceOn