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

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons86250

Becker,  V.
Junior Research Group Population Dynamics, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons86263

Briesen,  H.
Junior Research Group Population Dynamics, Max Planck Institute for Dynamics of Complex Technical Systems, Max Planck Society;

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Zitation

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.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0013-93DD-D
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]