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Structural change in non-fractal particle clusters under fluid stress

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Title: Structural change in non-fractal particle clusters under fluid stress
Authors: Harada, S. Browse this author →KAKEN DB
Tanaka, R. Browse this author
Nogami, H. Browse this author
Sawada, M. Browse this author
Asakura, K. Browse this author
Keywords: Particle cluster
Shear flow
Numerical analysis
Stokesian dynamics
Issue Date: 20-Jul-2007
Publisher: Elsevier B.V.
Journal Title: Colloids and Surfaces A Physicochemical and Engineering Aspects
Volume: 302
Issue: 1-3
Start Page: 396
End Page: 402
Publisher DOI: 10.1016/j.colsurfa.2007.03.003
Abstract: The restructuring of particle clusters having a dense packing structure under fluid stress is investigated numerically. The rearrangement of particles in the cluster and the breakage of their interparticle bonds in simple shear flow are examined by the Lagrangian-type simulation. The hydrodynamic force exerted on multiple particles is estimated by Stokesian dynamics approach. The interparticle force is calculated from the retarded van der Waals potential based on the Lifshitz theory. The simulation results show that the particle cluster rotates with the rotation of the surrounding flow and deforms due to the fluid stress along the principal axes of the stress tensor. These complex effects bring the irreversible change of the internal structure to the cluster. It is found that the structural change of the cluster can be explained by the initial rearrangement of primary particles and the successive crack growth that takes a long time. Such a long-term structural change is analogous to that of the fatigue crack growth of solid materials. We discuss the dynamics of the restructuring of a dense cluster from this point of view and propose a mathematical model which describes the restructuring process in a flow field.
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 原田 周作

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