Induced-charge electro-osmosis in dielectric annuli
This paper reports an analytical study on the induced-charge electro-osmosis (ICEO) within a leaky dielectric annulus subjected to an AC electric field. An interesting non-monotonic variation of the ICEO flow with the increasing AC frequency is revealed. This is different from the monotonic decrease...
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sg-ntu-dr.10356-1413872020-06-08T04:33:06Z Induced-charge electro-osmosis in dielectric annuli Feng, Huicheng Wong, Teck Neng School of Mechanical and Aerospace Engineering Engineering::Mechanical engineering Induced-charge Electro-osmosis Leaky Dielectric Annulus This paper reports an analytical study on the induced-charge electro-osmosis (ICEO) within a leaky dielectric annulus subjected to an AC electric field. An interesting non-monotonic variation of the ICEO flow with the increasing AC frequency is revealed. This is different from the monotonic decrease of the ICEO flow around a cylinder submerged in an unbounded electrolyte solution upon increasing the AC frequency. Moreover, the ICEO flow is significantly reduced and may reverse direction due to the existence of the outer cylinder, depending on the charging responses of the annulus and the electrolyte solution, and the annulus geometry. In this analysis, we consider both the space charge layers (SCLs) and the electric double layers (EDLs) established within the solid and the liquid sides of the solid–liquid interfaces, respectively. The ICEO flow forms eight vortices within the annulus, which show a potential for mixing enhancement in micro/nanofluidics. As the AC phase increases, the ICEO flow changes periodically with a period half of the AC period. The outer cylinder presents a significant influence on the ICEO flow within the annulus since it affects the local electric fields and the induced zeta potentials of the cylinders. The present study may provide references for microchip fabrications with non-contact electrodes and biocell manipulations by electric fields. MOE (Min. of Education, S’pore) 2020-06-08T04:33:05Z 2020-06-08T04:33:05Z 2018 Journal Article Feng, H., & Wong, T. N. (2018). Induced-charge electro-osmosis in dielectric annuli. Applied Mathematics and Computation, 333, 133-144. doi:10.1016/j.amc.2018.03.106 0096-3003 https://hdl.handle.net/10356/141387 10.1016/j.amc.2018.03.106 2-s2.0-85045268652 333 133 144 en Applied Mathematics and Computation © 2018 Elsevier Inc. All rights reserved. |
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Engineering::Mechanical engineering Induced-charge Electro-osmosis Leaky Dielectric Annulus Feng, Huicheng Wong, Teck Neng Induced-charge electro-osmosis in dielectric annuli |
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This paper reports an analytical study on the induced-charge electro-osmosis (ICEO) within a leaky dielectric annulus subjected to an AC electric field. An interesting non-monotonic variation of the ICEO flow with the increasing AC frequency is revealed. This is different from the monotonic decrease of the ICEO flow around a cylinder submerged in an unbounded electrolyte solution upon increasing the AC frequency. Moreover, the ICEO flow is significantly reduced and may reverse direction due to the existence of the outer cylinder, depending on the charging responses of the annulus and the electrolyte solution, and the annulus geometry. In this analysis, we consider both the space charge layers (SCLs) and the electric double layers (EDLs) established within the solid and the liquid sides of the solid–liquid interfaces, respectively. The ICEO flow forms eight vortices within the annulus, which show a potential for mixing enhancement in micro/nanofluidics. As the AC phase increases, the ICEO flow changes periodically with a period half of the AC period. The outer cylinder presents a significant influence on the ICEO flow within the annulus since it affects the local electric fields and the induced zeta potentials of the cylinders. The present study may provide references for microchip fabrications with non-contact electrodes and biocell manipulations by electric fields. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Feng, Huicheng Wong, Teck Neng |
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Article |
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Feng, Huicheng Wong, Teck Neng |
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Feng, Huicheng |
title |
Induced-charge electro-osmosis in dielectric annuli |
title_short |
Induced-charge electro-osmosis in dielectric annuli |
title_full |
Induced-charge electro-osmosis in dielectric annuli |
title_fullStr |
Induced-charge electro-osmosis in dielectric annuli |
title_full_unstemmed |
Induced-charge electro-osmosis in dielectric annuli |
title_sort |
induced-charge electro-osmosis in dielectric annuli |
publishDate |
2020 |
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https://hdl.handle.net/10356/141387 |
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1681056130336292864 |