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  Restructuring of colloidal aggregates in shear flows and limitations of the free-draining approximation

Becker, V., Schlauch, E., Briesen, H., & Behr, M. (2009). Restructuring of colloidal aggregates in shear flows and limitations of the free-draining approximation. Journal of Colloid and Interface Science, 339(2), 362-372. doi:10.1016/j.jcis.2009.07.022.

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Becker, V.1, Autor           
Schlauch, E.2, Autor
Briesen, H.1, Autor           
Behr, M.2, Autor
Affiliations:
1Junior Research Group Population Dynamics, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society, ou_1738145              
2RWTH Aachen University, Chair for Computational Analysis of Technical Systems, CCES, Aachen, Germany TU München, ou_persistent22              

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 Zusammenfassung: We investigated the restructuring behavior of colloidal aggregates by means of the discrete element method. We used a recently proposed model [V. Becker, H. Briesen, Physical Review E 78 (6) (2008) 061404] for tangential inter-particle forces, capable of supporting bending moments. We extended this model by the capability of supporting torsiona moments. The time evolution of the aggregates’ radius of gyration was tracked and a power law relation between the number of primary particles and the final radius of gyration was found. For the hydrodynamic drag forces the free-draining approximation is employed. We investigated the quality of the free-draining approximation by fully resolved finite element simulations for small aggregates. We found that the free-draining approximation overestimates the drag forces and we identified the usage of effective shear rates as a possible ansatz for reduced modeling of hydrodynamic forces. Copyright © 2009 Elsevier B.V. All rights reserved. [accessed November 19, 2009]

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Sprache(n): eng - English
 Datum: 2009
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 439238
DOI: 10.1016/j.jcis.2009.07.022
 Art des Abschluß: -

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Titel: Journal of Colloid and Interface Science
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 339 (2) Artikelnummer: - Start- / Endseite: 362 - 372 Identifikator: -