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Micromachines 2016, 7(7), 109; doi:10.3390/mi7070109

Quantification of Vortex Generation Due to Non-Equilibrium Electrokinetics at the Micro/Nanochannel Interface: Spectral Analysis

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: 22 June 2016 / Accepted: 23 June 2016 / Published: 27 June 2016
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Abstract

We report on our investigation of a low Reynolds number non-equilibrium electrokinetic flow in a micro/nanochannel platform. Non-equilibrium electrokinetic phenomena include so-called concentration polarization in a moderate electric field and vortex formation in a high electric field. We conducted a spectral analysis of non-equilibrium electrokinetic vortices at a micro/nanochannel interface. We found that periodic vortices are formed while the frequency varies with the applied voltages and solution concentrations. At a frequency as high as 60 Hz, vortex generation was obtained with the strongest electric field and the lowest concentration. The power spectra show increasing frequency with increasing voltage or decreasing concentration. We expect that our spectral analysis results will be useful for micromixer developers in the micromachine research field. View Full-Text
Keywords: Vortex generation; spectral analysis; concentration polarization; micro/nanochannel; micromixer; electrokinetics Vortex generation; spectral analysis; concentration polarization; micro/nanochannel; micromixer; electrokinetics
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MDPI and ACS Style

Lee, S.J.; Jeon, T.-J.; Kim, S.M.; Kim, D. Quantification of Vortex Generation Due to Non-Equilibrium Electrokinetics at the Micro/Nanochannel Interface: Spectral Analysis. Micromachines 2016, 7, 109.

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