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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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-93DD-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0023-F265-B
Genre: Journal Article

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 Creators:
Becker, V.1, Author              
Schlauch, E.2, Author
Briesen, H.1, Author              
Behr, M.2, Author
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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 Abstract: 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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Language(s): eng - English
 Dates: 2009
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 439238
DOI: 10.1016/j.jcis.2009.07.022
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Title: Journal of Colloid and Interface Science
Source Genre: Journal
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Pages: - Volume / Issue: 339 (2) Sequence Number: - Start / End Page: 362 - 372 Identifier: -