Effects of ionic concentration gradient on electroosmotic flow mixing in a microchannel
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Date
2014-11-08
Authors
Peng, Ran
Li, Dongqing
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
Effects of ionic concentration gradient on electroosmotic flow (EOF) mixing of one stream of a high concentration electrolyte solution with a stream of a low concentration electrolyte solution in a microchannel are investigated numerically. The concentration field, flow field and electric field are strongly coupled via concentration dependent zeta potential, dielectric constant and electric conductivity. The results show that the electric field and the flow velocity are non-uniform when the concentration dependence of these parameters is taken into consideration. It is also found that when the ionic concentration of the electrolyte solution is higher than 1 M, the electrolyte solution essentially cannot enter the channel due to the extremely low electroosmotic flow mobility. The effects of the concentration dependence of zeta potential, dielectric constant and electric conductivity on electroosmotic flow mixing are studied.
Description
The final publication is available at Elsevier via http://dx.doi.org/10.1016/j.jcis.2014.10.061. © 2014. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Keywords
Flow mixing, Electroosmotic flow, Ionic concentration, Zeta potential, Dielectric constant