Numerical analysis of electroosmosis in a micro-cavity

Dolfred V. Fernandes, Sangmo Kang, Yong K. Suh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The bulk motion of an aqueous solution induced by the application of DC and AC electric fields is studied numerically. The physical model consists of a rectangular micro-cavity filled with dilute, symmetric, binary electrolyte and two completely polarizable cylindrical electrodes. The electric double layer (EDL) model coupled with Navier-Stokes equations governing the electroosmotic flow has been described. The ion-transport in the domain is obtained by solving Poisson-Nernst-Plank equations. We employed IB (immersed boundary) technique for the implementation of boundary conditions and semi-implicit fractional-step method for solving the momentum equations. The Poisson equation for potential distribution is coupled with Nernst-Plank equations for ionic species distribution and solved using CGSTAB iteration solver. Numerical codes are validated using bench-mark problems; driven-cavity-flow and flow over a cylinder. The electric field is almost completely balanced by the accumulation of the counter-ions at the electrodes, at steady state the potential in the most part of domain is zero. The flow field is found predominant in the region near the electrodes.

Original languageEnglish
Title of host publicationProceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
Pages475-481
Number of pages7
EditionPART A
DOIs
Publication statusPublished - 2008
Event6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008 - Darmstadt, Germany
Duration: 23-06-200825-06-2008

Publication series

NameProceedings of the 6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
NumberPART A

Conference

Conference6th International Conference on Nanochannels, Microchannels, and Minichannels, ICNMM2008
Country/TerritoryGermany
CityDarmstadt
Period23-06-0825-06-08

All Science Journal Classification (ASJC) codes

  • Process Chemistry and Technology

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