Use of immersed boundary method for the analysis of electro-osmotic flow generated by a pair of cylindrical electrodes in a micro-cavity

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

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

Abstract

The bulk motion of an aqueous solution induced by the application of DC electric field is studied numerically. The physical model consists of a micro-cavity with two completely polarizable cylindrical electrodes. The electric double layer (EDL) model coupled with Navier-Stokes equations governing the electroosmotic flow has been described. The Nernst-Planck model uses two extra equations for the prediction of ion concentration. We employed IB (immersed boundary) technique for the implementation of boundary conditions and semi-implicit fractional-step method for solving the governing equations. A new method is described for implementing concentration boundary conditions on the electrodes. The bench mark problems, driven cavity flow and flow over a cylnder were used for the validation of our present code. The numerical results are compared with the analytical results obtained using Gouy-Chapman-Stern model for the one dimensional case. For the two dimensional case the flow field and the ionic concentration distributions obtained shows that the electoosmotic effect is predominant in the thin region around the electrode.

Original languageEnglish
Title of host publication2008 Proceedings of the ASME Micro/Nanoscale Heat Transfer International Conference, MNHT 2008
Pages187-192
Number of pages6
DOIs
Publication statusPublished - 2008
Event1st ASME Micro/Nanoscale Heat Transfer International Conference, MNHT08 - Tainan, Taiwan, Province of China
Duration: 06-01-200809-01-2008

Publication series

Name2008 Proceedings of the ASME Micro/Nanoscale Heat Transfer International Conference, MNHT 2008
VolumePART A

Conference

Conference1st ASME Micro/Nanoscale Heat Transfer International Conference, MNHT08
Country/TerritoryTaiwan, Province of China
CityTainan
Period06-01-0809-01-08

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • General Materials Science
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics

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