| Modeling of combined electroosmotic and capillary flow in microchannels. | |
| | |
MedLine Citation:
|
PMID: 20206000 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
In the present study, theoretical model for the transient response of a capillary flow under the combined effects of electroosmotic and capillary forces at low Reynolds number is presented. The governing equation is derived based on the balance among the electrokinetic, surface, viscous and gravity forces. A non-dimensional transient governing equation for the penetration depth as a function of time is obtained by normalizing the viscous, gravity and electroosmotic forces with surface tension force. A new non-dimensional group for the electroosmotic force, E(o), is obtained through the non-dimensional analysis. This new non-dimensional group is a representation of combined electroosmosis and surface tension, i.e., capillarity. The numerical solution of governing equation is obtained to study the effect of different operating parameters on the flow front transport. In a combined flow, it is observed that the flow with positive and low negative magnitude E(o) numbers, the attainment of equilibrium penetration depth is similar to a capillary flow. In case of high negative magnitude E(o) numbers, complete filling of the channel is observed. The electrolyte with lower permittivity delays the progress of the flow front whereas a large EDL transports the electrolyte quickly. Higher viscous and gravity forces also delay the transport process in the combined flow. This model suggests that in combined flow the electrokinetic parameters also play an important role on the capillary flow and experiments are required to confirm this electrokinetic effect on capillary transport. |
| | |
Authors:
|
Prashant R Waghmare; Sushanta K Mitra |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-02-06 |
Journal Detail:
|
Title: Analytica chimica acta Volume: 663 ISSN: 1873-4324 ISO Abbreviation: Anal. Chim. Acta Publication Date: 2010 Mar |
Date Detail:
|
Created Date: 2010-03-08 Completed Date: 2010-06-17 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 0370534 Medline TA: Anal Chim Acta Country: Netherlands |
Other Details:
|
Languages: eng Pagination: 117-26 Citation Subset: IM |
Copyright Information:
|
Copyright 2010 Elsevier B.V. All rights reserved. |
Affiliation:
|
Micro and Nano-scale Transport Laboratory, Department of Mechanical Engineering, University of Alberta, Edmonton, Canada T6G 2G8. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Chromatography, Micellar Electrokinetic Capillary
/
methods* Electrolytes / chemistry Electroosmosis / methods* Microfluidic Analytical Techniques / methods* Models, Chemical* Surface Tension Time Factors |
| Chemical | |
Reg. No./Substance:
|
0/Electrolytes |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Therapeutic Drug Monitoring of Levetiracetam.
Next Document: Methods for the determination and speciation of mercury in natural waters-A review.