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Hydrodynamic stress on fractal aggregates of spheres

Bossis, G. and Meunier, A. and Brady, J. F. (1991) Hydrodynamic stress on fractal aggregates of spheres. Journal of Chemical Physics, 94 (7). pp. 5064-5070. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:BOSjcp91

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Abstract

We calculate the average hydrodynamic stress on fractal aggregates of spheres using Stokesian dynamics. We find that for fractal aggregates of force-free particles, the stress does not grow as the cube of the radius of gyration, but rather as the number of particles in the aggregate. This behavior is only found for random aggregates of force-free particles held together by hydrodynamic lubrication forces. The stress on aggregates of particles rigidly connected by interparticle forces grows as the radius of gyration cubed. We explain this behavior by examining the transmission of the tension along connecting lines in an aggregate and use the concept of a persistance length in order to characterize this stress transmission within an aggregate.


Item Type:Article
Additional Information:Copyright © 1991 American Institute of Physics. Received 23 April 1990; accepted 4 December 1990. The work was supported by NATO and CNRS/NSF grants. Computer time has been provided by the Centre de Calcul Vectoriel our la Recherche.
Subject Keywords:FRACTALS, HYDRODYNAMICS, STRESSES, STRESS DISTRIBUTION, COLLOIDS, AGGLOMERATION, FORCES, PARTICULATES
Record Number:CaltechAUTHORS:BOSjcp91
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:BOSjcp91
Alternative URL:http://dx.doi.org/10.1063/1.460543
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:10962
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:21 Jun 2008
Last Modified:26 Dec 2012 10:07

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