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Numerical modelling of electroosmotic driven flow in nanoporous media by lattice Boltzmann method

Li, Bo, Zhou, Wenning, Yan, Yuying, Han, Zhiwu, Ren, Luquan (2013) Numerical modelling of electroosmotic driven flow in nanoporous media by lattice Boltzmann method. Journal of Bionic Engineering, 10 (1). pp. 90-99. ISSN 1672-6529. (doi:10.1016/S1672-6529(13)60203-6) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided) (KAR id:87902)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided.
Official URL:
https://doi.org/10.1016/S1672-6529%2813%2960203-6

Abstract

The lattice Boltzmann method was employed to simulate electroosmotic driven flow and Debye layer screening in conducting electrolyte around a porous structure with average size of 40 nm. The charge screening around the nanopores was investigated by solving the vector-superpositioned potential equilibrium distribution function and adding electro-kinetic force term to the evolution equation. In this intermediate case of moderate Debye length, the electrophoresis problem becomes complicated. The motion of the particles distorts the screening cloud, which becomes asymmetric, resulting in very complex interactions between the electrolyte, the screening cloud and the particle; but the Electroosmotic Flow (EOF) behaviour was still considered based on the Helmoholtz-Smoluchowski model with adaptation to fit nanoporous flow in the porous structure. In the present approach, the flow in the nanopores is directly modelled; the detailed flow information can be obtained by simplifying the repeated macrostructure. Due to the symmetry of the domain, the size of computational domain can be largely reduced by less repeated spherical nanoparticles. Each pore of the medium contains several lattice nodes on the simplified curved edges and potential gradients are produced by adjusting the zeta potential value. The velocity results for pressure-driven and EOF flows agree well with the analytical solutions and recent experimental results. In particular, the interface between solid particles and fluids, the influences of porosity, solid particle diameter, yield stress and electric parameters in EOF were investigated. The anti-adhesion effect of electroosmotic pumping effect was evaluated, and the pulsed DC was applied in order to enhance the performance of the electroosmotic pumping. The results demonstrate that the present lattice Boltzmann model is capable of modelling flow through nanoporous media at certain restrictions while some results deviate from the predictions based on the macroscopic theories.

Item Type: Article
DOI/Identification number: 10.1016/S1672-6529(13)60203-6
Uncontrolled keywords: electroosmotic flow; electroosmotic pumping; nanoporous media; lattice Boltzmann method; numerical modelling; anti-adhesion
Subjects: T Technology > TJ Mechanical engineering and machinery > Control engineering
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Depositing User: Amy Boaler
Date Deposited: 04 May 2021 14:31 UTC
Last Modified: 16 Nov 2021 10:27 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/87902 (The current URI for this page, for reference purposes)

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