Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 364, Issue 2, Pages 588-593Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2011.08.070
Keywords
Microfluidic system; Mixing enhancement; Induced-charge electrokinetic flow; Vortex; Flow rate; Concentration difference
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Funding
- Canada Research Chair Program
- Natural Sciences and Engineering Research Council (NSERC) of Canada
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This paper presents a numerical study of controlling the flow rate and the concentration in a microchannel network by utilizing induced-charge electrokinetic flow (ICEKF). ICEKF over an electrically conducting surface in a microchannel will generate vortices, which can be used to adjust the flow rates and the concentrations in different microchannel branches. The flow field and concentration field were studied under different applied electric fields and with different sizes of the conducting surfaces. The results show that, by using appropriate size of the conducting surfaces in appropriate locations, the microfluidic system can generate not only streams of the same flow rate or linearly decreased flow rates in different channels, but also different, uniform concentrations within a short mixing length quickly. (C) 2011 Elsevier Inc. All rights reserved.
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