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Analysis of EDL Effect for Pressure-Driven 3D Developing Micro-Scale Flow

E. Y. K. Ng¹, S. T. Tan²

1 Corresponding author. School of Mechanical and Aerospace Engineering, College of Engineering, Nanyang Technological University, 50 Nanyang Avenue Singapore 639798. email: mykng@ntu.edu.sg, Tel: (065)6790-4455, Fax: (065)6791-1859
2 Design Assurance, Seagate Technology International, 7000 Ang Mo Kio, Avenue 5, Singapore 569877.

Computer Modeling in Engineering & Sciences 2008, 23(1), 13-28. https://doi.org/10.3970/cmes.2008.023.013

Abstract

Microchannels have been recognized as a very effective chemical separation and heat transfer device. The electrical double layer (EDL) effect in a micro-scale flow is however anticipated to be critical. In this paper, Nernst-Planck model (NPM), is used to predict the ion concentration distribution as it is reported to be a more appropriate model for developing microchannel flow. The governing equations are discretised for developing rectangular microchannel flows in Cartesians coordinate. An additional body force source term that is relating to the electric potential, resulted from the EDL effect is introduced in the conventional z-axis momentum equation as a body force, thereby modifying the flow characteristics. A finite-volume scheme is developed to solve the set of partial differential equations.
The focus of this paper is on the documentation for the effect of aspect- ratio (AR), Schmidt Number (Sc) and Wall Electrical Potential (ξ_o^¯ ) on the performance of microchannel including the friction coefficient (fRe), entrance length (L_e) and Nusselt number (Nu).

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Keywords

Developing Flow, Heat Transfer, Micro-scale, EDL, Pressure-driven, Nernst-Planck

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Cite This Article

Y., E., Tan, S. T. (2008). Analysis of EDL Effect for Pressure-Driven 3D Developing Micro-Scale Flow. CMES-Computer Modeling in Engineering & Sciences, 23(1), 13–28. https://doi.org/10.3970/cmes.2008.023.013

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