MSM 99
MSM 99
Technical Proceedings of the 1999 International Conference on Modeling and Simulation of Microsystems

Applications: Microfluidics Chapter 16

Hydrodynamic Dispersion of a Neutral Non-Reacting Solute in Electroosmotic Flows

Authors: S.K. Griffiths and R.H. Nilson

Affilation: Sandia National Laboratory, United States

Pages: 558 - 561

Keywords: dispersion, electroosmotic, electrokinetic, flow, transport

Abstract:
To investigate hydrodynamic dispersion in electroosmotic ?ow, we have derived an asymptotic series solution for the problem of two-dimensional species transport in a tube or channel. This solution is applicable to the late-time diÆusive and advective transport of a neutral non-reacting species in an incompressible ?uid having uniform and constant electrical and transport properties. We find that the axial dispersion is proportional to the square of the Peclet number based on the characteristic transverse dimension of the tube or channel when the Debye length is large. When the Debye length is small, the dispersion varies as the square of the Peclet number based on the Debye length.


ISBN: 0-9666135-4-6
Pages: 697

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