Unsteady electroosmotic flow in asymmetrically charged slit microchannel containing salt-free solution

Author

Chang, Shih-Hsiang

Author_Institution

Dept. of Mech. Eng., Far East Univ. Tainan, Tainan, Taiwan

Volume

2

fYear

2010

fDate

5-7 May 2010

Firstpage

565

Lastpage

568

Abstract

A theoretical study on the electroosmotic flow through a slit microchannel containing a salt-free solution is presented for dissimilar constant surface charges. Based on the exact analytical solutions for the electric potential distribution and the transient electroosmotic flow velocity, a systematic parametric study on the characteristics of the transient electroosmotic flow is investigated. The two dominant parameters affecting the transient behavior of electroosmotic flow are found to be the ratio of surface charges and the width of slit. In addition, it is found that the electroosmotic flow always moves in the same direction, irrespective of the ratio of surface charge densities, which is different from that observed in an electrolyte solution.

Keywords

Navier-Stokes equations; electrohydrodynamics; electrophoresis; flow instability; microchannel flow; Navier-Stokes equation; asymmetrically charged slit microchannel; dissimilar constant surface charge; electric potential distribution; electrolyte solution; exact analytical solutions; salt-free solution; slit width; surface charge density; transient electroosmotic flow velocity; unsteady electroosmotic flow; Automatic control; Communication system control; Distributed computing; Electric potential; Electrokinetics; Microchannel; Poisson equations; Steady-state; Transient analysis; Velocity control; Poisson-Boltzmann equation; electroosmotic flow; salt-free solution;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer Communication Control and Automation (3CA), 2010 International Symposium on

Conference_Location

Tainan

Print_ISBN

978-1-4244-5565-2

Type

conf

DOI

10.1109/3CA.2010.5533727

Filename

5533727