Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/103418
Title: Transient characteristics of electric double layer charging and the associated induced-charge electrokinetic flow
Authors: Zhao, Cunlu
Yang, Chun
Wang, Qiuwang
Zeng, Min
Keywords: DRNTU::Engineering::Mechanical engineering
Electrokinetic Phenomena
Electrolytes
Issue Date: 2018
Source: Zhao, C., Yang, C., Wang, Q., & Zeng, Min. (2018). Transient characteristics of electric double layer charging and the associated induced-charge electrokinetic flow. Physics of Fluids, 30(12), 122005-. doi:10.1063/1.5055866
Series/Report no.: Physics of Fluids
Abstract: This paper presents a detailed numerical analysis of the transient characteristics of electric double layer (EDL) charging and the associated induced-charge electrokinetic (ICEK) flow around an ideally polarizable cylinder. To this end, we solved numerically the coupled Poisson-Nernst-Planck and Navier-Stokes equations with the finite element method. The numerical simulation provides an unprecedented full-field (including the EDL region) characterization of the transient evolutions of ion transport, electric potential, and fluid flow during the EDL charging. The simulation results show that the EDL charging is driven by the electric current normal to the cylinder surface. With EDL being charged, the charge density in the EDL counteracts the local external electric field on the cylinder surface to reduce the electric current, which then leads to the slowing down of the EDL charging. At the steady state, the EDL becomes fully charged and the charge density in EDL exactly counteracts the external electric field, and then the EDL charging stops. During the EDL charging, the interaction of the external electric field with the charge density in the EDL drives the liquid in the EDL to move first, and then as time evolves, the liquid in the bulk electrolyte sets in motion because of the momentum transfer between the EDL and the bulk. These findings are conducive to the understanding of the transient dynamics of ICEK phenomena around polarizable objects.
URI: https://hdl.handle.net/10356/103418
http://hdl.handle.net/10220/47787
ISSN: 1070-6631
DOI: 10.1063/1.5055866
Rights: © 2018 Authors. All rights reserved. This paper was published by AIP Publishing in Physics of Fluids and is made available with permission of Authors.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MAE Journal Articles

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