NDLI: Numerical Solution of Two-Fluid Electroosmotic Flow

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Gao, Yandong Yap, Y. F. Wong, T. N. Chai, J. C. Yang, C. Ooi, K. T.
Copyright Year	2005
Abstract	Two-fluid flows in microchannel are often found in biological analysis, such as during ion exchange or solvent extraction from one phase to another. In this article, a numerical scheme is presented to describe a two-fluid flow in microchannel with electroosmotic (EO) effects. In this two-fluid system, the interfacial viscous force of a high EO mobility fluid drags a low EO mobility fluid; the high EO mobility fluid is driven by electroosmosis. We particularly analyze the electric double layer (EDL) regions close to the wall and the interface in the high EO mobility fluid. As the governing equation of the electrical potential is singularly perturbed, finer meshes are adopted to capture these EDL regions. In simulation, the interface between the two fluids evolves along the flow direction as the flow develops. Level set method is used to capture the interface implicitly. A localized mass preservation scheme is used to ensure mass conservation. A finite-volume method is used to solve the coupled electric potential equation, level set equations and Navier-Stokes equation. The validity of the numerical scheme is evaluated by comparing its predictions with the results of the analytical solutions in the fully developed regions. The interface positions; pressure gradients; mass flow rates and velocity profiles of the two fluids along the channels are obtained numerically.
Sponsorship	Nanotechnology Institute
Starting Page	343
Ending Page	348
Page Count	6
File Format	PDF
ISBN	0791841855
DOI	10.1115/ICMM2005-75005
e-ISBN	0791837580
Volume Number	ASME 3rd International Conference on Microchannels and Minichannels, Part B cont’d
Conference Proceedings	ASME 3rd International Conference on Microchannels and Minichannels
Language	English
Publisher Date	2005-06-13
Publisher Place	Toronto, Ontario, Canada
Access Restriction	Subscribed
Subject Keyword	Mechanical admittance Electric potential Fluids Navier-stokes equations Preservation Simulation Electroosmosis Pressure gradient Ion exchange Flow (dynamics) Finite volume methods Microchannels
Content Type	Text
Resource Type	Article

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