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  From random sphere packings to regular pillar arrays: Effect of the macroscopic confinement on hydrodynamic dispersion

Daneyko, A., Khirevich, S., Hoeltzel, A., Seidel-Morgenstern, A., & Tallarek, U. (2011). From random sphere packings to regular pillar arrays: Effect of the macroscopic confinement on hydrodynamic dispersion. Journal of Chromatography A, 1218(45), 8231-8248. doi:10.1016/j.chroma.2011.09.039.

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 Urheber:
Daneyko, A.1, Autor
Khirevich, S.1, Autor
Hoeltzel, A.1, Autor
Seidel-Morgenstern, A.2, 3, Autor           
Tallarek, U.1, Autor
Affiliations:
1Philipps-Universität Marburg,Department of Chemistry, Marburg, Germany, ou_persistent22              
2Physical and Chemical Foundations of Process Engineering, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society, ou_1738150              
3Otto-von-Guericke-Universität Magdeburg, External Organizations, ou_1738156              

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Schlagwörter: Ordered pillar arrays; Random sphere packings; Packing disorder; Wall effects; Eddy dispersion; High-performance computing
 Zusammenfassung: Flow and mass transport in bulk and confined chromatographic supports comprising random packings of solid, spherical particles and hexagonal arrays of solid cylinders (regular pillar arrays) are studied over a wide flow velocity range by a numerical analysis scheme, which includes packing generation by a modified Jodrey-Tory algorithm, three-dimensional flow field calculations by the lattice-Boltzmann method, and modeling of advective-diffusive mass transport by a random-walk particle-tracking technique. We demonstrate the impact of the confinement and its cross-sectional geometry (circular, quadratic, semicircular) on transient and asymptotic transverse and longitudinal dispersion in random sphere packings, and also address the influence of protocol-dependent packing disorder and the particle-aspect ratio. Plate height curves are analyzed with the Giddings equation to quantify the transcolumn contribution to eddy dispersion. Confined packings are compared with confined arrays under the condition of identical bed porosity, conduit cross-sectional area, and laterally fully equilibrated geometrical wall and corner effects on dispersion. Fluid dispersion in a regular pillar array is stronger affected by the macroscopic confinement and does not resemble eddy dispersion in random sphere packings, because the regular microstructure cannot function as a mechanical mixer like the random morphology. Giddings’ coupling theory fails to preserve the nature of transverse dispersion behind the arrays’ plate height curves, which approach a linear velocity-dependence as transverse dispersion becomes velocity-independent. Upon confinement this pseudo-diffusive behavior can outweigh the performance advantage of the regular over the random morphology. Copyright © 2011 Published by Elsevier B.V. [accessed Nobember 16th 2011]

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Sprache(n): eng - English
 Datum: 2011
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 572130
DOI: 10.1016/j.chroma.2011.09.039
 Art des Abschluß: -

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Titel: Journal of Chromatography A
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Amsterdam : Elsevier
Seiten: - Band / Heft: 1218 (45) Artikelnummer: - Start- / Endseite: 8231 - 8248 Identifikator: ISSN: 0021-9673
CoNE: https://pure.mpg.de/cone/journals/resource/954925527837_1