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Micromachines 2016, 7(7), 127; doi:10.3390/mi7070127

Quantification of Vortex Generation Due to Non-Equilibrium Electrokinetics at the Micro/Nanochannel Interface: Particle Tracking Velocimetry

1
Department of Mechanical Engineering, Sogang University, Seoul 04107, Korea
2
Department of Biological Engineering, Inha University, Incheon 22212, Korea
3
Department of Mechanical Engineering, Inha University, Incheon 22212, Korea
*
Authors to whom correspondence should be addressed.
Academic Editor: Joost Lötters
Received: 3 June 2016 / Revised: 11 July 2016 / Accepted: 16 July 2016 / Published: 21 July 2016
View Full-Text   |   Download PDF [3388 KB, uploaded 21 July 2016]   |  

Abstract

We describe a quantitative study of vortex generation due to non-equilibrium electrokinetics near a micro/nanochannel interface. The microfluidic device is comprised of a microchannel with a set of nanochannels. These perm-selective nanochannels induce flow instability and thereby produce strong vortex generation. We performed tracking visualization of fluorescent microparticles to obtain velocity fields. Particle tracking enables the calculation of an averaged velocity field and the velocity fluctuations. We characterized the effect of applied voltages and electrolyte concentrations on vortex formation. The experimental results show that an increasing voltage or decreasing concentration results in a larger vortex region and a strong velocity fluctuation. We calculate the normalized velocity fluctuation—whose meaning is comparable to turbulent intensity—and we found that it is as high as 0.12. This value is indicative of very efficient mixing, albeit with a small Reynolds number. View Full-Text
Keywords: vortex generation; nanochannel; microparticle; particle tracking velocimetry vortex generation; nanochannel; microparticle; particle tracking velocimetry
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, S.J.; Kwon, K.; Jeon, T.-J.; Kim, S.M.; Kim, D. Quantification of Vortex Generation Due to Non-Equilibrium Electrokinetics at the Micro/Nanochannel Interface: Particle Tracking Velocimetry. Micromachines 2016, 7, 127.

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