NDLI: Three-dimensional non-linear AC electro-osmotic flow induced by a face-to-face, asymmetric pair of planar electrodes

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Three-dimensional non-linear AC electro-osmotic flow induced by a face-to-face, asymmetric pair of planar electrodes

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Microfluidics and Nanofluidics : Volume 9, Issue 1, July 2010

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Three-dimensional non-linear AC electro-osmotic flow induced by a face-to-face, asymmetric pair of planar electrodes

Content Provider	Springer Nature Link
Author	Chen, Jhih Lin Shih, Wei Hung Hsieh, Wen Hsin
Copyright Year	2010
Abstract	This paper demonstrates a three-dimensional, non-linear, AC electro-osmotic extensional flow induced by the capacitive charging of a face-to-face pair of planar electrodes. These two planar electrodes facing each other had different sizes and shapes. The extensional flow was attributed to the rectification of the stagnation-point flow in the center region by the three-dimensional vortices at the corners of the smaller electrode. The measured flow velocity near the edge of the electrode was on the order of millimeters per second. The shape of the electrode affected the distribution of the electric field and thereby modified the electro-osmotic flow. A change in the shape of the smaller electrode would significantly affect the flow fields and could cause a variation of a factor of 10 in the measured flow velocity. An equivalent electronic circuit of the experimental apparatus was developed. Based on the equivalent electronic circuit, the calculated critical frequency was in good agreement with the measured optimal velocity frequency. The quadratic dependence of the velocity on the voltage drop across the liquid, a characteristic of the capacitive charging process, was also reported in this paper.
Starting Page	579
Ending Page	584
Page Count	6
File Format	PDF
ISSN	16134982
Journal	Microfluidics and Nanofluidics
Volume Number	9
Issue Number	2-3
e-ISSN	16134990
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-03-06
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	AC electro-osmotic flow Micro-fluidic manipulation Capacitive charging Asymmetric electrodes Flow rectification Biomedical Engineering Engineering Fluid Dynamics
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Materials Chemistry Condensed Matter Physics Electronic, Optical and Magnetic Materials

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