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  Pore-Scale Dispersion in Electrokinetic Flow through a Random Sphere Packing

Hlushkou, D., Khirevich, S., Apanasovich, V., Seidel-Morgenstern, A., & Tallarek, U. (2007). Pore-Scale Dispersion in Electrokinetic Flow through a Random Sphere Packing. Analytical Chemistry, 79(1), 113-121. doi:10.1021/ac061168r.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-9873-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-B65C-8
Genre: Journal Article

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Hlushkou, D.1, Author              
Khirevich, S.1, 2, Author
Apanasovich, V.2, Author
Seidel-Morgenstern, A.1, 3, Author              
Tallarek, U.1, Author
Affiliations:
1Otto-von-Guericke-Universität Magdeburg, External Organizations, escidoc:1738156              
2Belarusian State University, Minsk, Belarus, escidoc:persistent22              
3Physical and Chemical Foundations of Process Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society, escidoc:1738150              

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 Abstract: The three-dimensional velocity field and corresponding hydrodynamic dispersion in electrokinetic flow through a random bulk packing of impermeable, nonconducting spheres are studied by quantitative numerical analysis. First, a fixed bed with interparticle porosity of 0.38 is generated using a parallel collective-rearrangement algorithm. Then, the interparticle velocity field is calculated using the lattice-Boltzmann (LB) method, and a random-walk particle-tracking method is finally employed to model advection-diffusion of an inert tracer in the LB velocity field. We demonstrate that the pore-scale velocity profile for electroosmotic flow (EOF) is nonuniform even under most ideal conditions, including a negligible thickness of the electrical double layer compared to the mean pore size, a uniform distribution of the electrokinetic potential at the solid-liquid interface, and the absence of applied pressure gradients. This EOF dynamics is caused by a nonuniform distribution of the local electrical field strength in the sphere packing and engenders significant hydrodynamic dispersion compared to pluglike EOF through a single straight channel. Both transient and asymptotic dispersion behaviors are analyzed for EOF in the context of packing microstructure and are compared to pressure-driven flow in dependence of the average velocity through the bed. A better hydrodynamic performance of EOF originates in a still much smaller amplitude of velocity fluctuations on a mesoscopic scale (covering several particle diameters), as well as on the microscopic scale of an individual pore. © 2007 American Chemical Society [accessed 2013 November 26th]

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Language(s): eng - English
 Dates: 2007
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: eDoc: 290812
DOI: 10.1021/ac061168r
Other: 5/07
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Title: Analytical Chemistry
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: - Volume / Issue: 79 (1) Sequence Number: - Start / End Page: 113 - 121 Identifier: ISSN: 0003-2700
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/111032812862552