MSM 2000
MSM 2000
Technical Proceedings of the 2000 International Conference on Modeling and Simulation of Microsystems

Computational Methods for Microfluidics Chapter 12

Electroosmotic Flow in a Tube or Channel for Non-Negligible Zeta Potentials

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

Affilation: Sandia National Laboratories, United States

Pages: 532 - 535

Keywords: electroosmotic, electrokinetic, flow

Abstract:
Numerical methods based on a shooting technique are employed to determine the electric potential and fluid velocity in a tube and channel when the zeta poten- tial is not small. In addition, new analytical solutions are presented for the fluid velocity in the extreme of a small Debye layer thickness. Asymptotic expressions for these results are provided for the limits of small and large zeta potentials. We find that increasing values of the wall potential always increase the mean fluid speed and yield a velocity profile having a more uniform speed near the center of the tube or channel.

Electroosmotic Flow in a Tube or Channel for Non-Negligible Zeta Potentials

ISBN: 0-9666135-7-0
Pages: 741