Abstract
In this work, expressions are constructed and solved that describe the velocity field of electroosmotic flow (EOF) in open tube capillary electrochromatography (CEC) systems when the possibility of having unequal tangential velocities at the liquid-solid interface is considered and a slip condition is employed as a boundary condition for the velocity of the EOF at the capillary wall. the coupled equations of hydrodynamics (momentum balance equation) and electrostatics (Poisson equation) are solved numerically in order to obtain the distribution of the velocity field as well as the value of the volumetric flow rate in the open tube. Also, expressions for the velocity field and the volumetric flow rate of the EOF are presented that are valid for certain electrolytic systems and for certain parameter values for which analytical solutions to the momentum balance and Poisson equations could be obtained. the results presented in this work indicate that having slip in the velocity of the EOF at the wall of the capillary could (i) substantially increase the electroosmotic velocity in the plug-flow region of the radial domain of the open capillary tube and (ii) increase the portion of the radial domain of the open capillary tube where the velocity of the EOF has a plug-flow profile, which in turn could increase the average velocity and volumetric flow rate of the EOF in the open capillary tube. Furthermore, the modeling approach and the results presented in this work indicate a method for experimentally evaluating the possibility of having slip in the velocity of the EOF at the capillary wall. © 2003 Elsevier Science (USA). All rights reserved.
Recommended Citation
B. A. Grimes and A. I. Liapis, "Expressions for Evaluating the Possibility of Slip at the Liquid-Solid Interface in Open Tube Capillary Electrochromatography," Journal of Colloid and Interface Science, vol. 263, no. 1, pp. 113 - 118, Elsevier, Jul 2003.
The definitive version is available at https://doi.org/10.1016/S0021-9797(03)00286-8
Department(s)
Chemical and Biochemical Engineering
Keywords and Phrases
Capillary electrochromatography; Electroosmotic flow; Electroosmotic velocity; Slip boundary condition
International Standard Serial Number (ISSN)
0021-9797
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2024 Elsevier, All rights reserved.
Publication Date
01 Jul 2003
Comments
University of Missouri, Grant None