Numerical simulation of particle settling and cohesion in liquid

In this study, the motions of particles and particle clusters in liquid were numerically simulated. The particles of two sizes (Dp=40μm and 20μm) settle while repeating cohesion and dispersion, and finally the sediment of particles are formed at the bottom of a hexahedron container which is filled u...

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Bibliographic Details
Published in:Journal of physics. Conference series 2009-02, Vol.147 (1), p.012072
Main Authors: Johno, Y, Satomi, M, Nakashima, K, Shigematsu, T, Ono, B
Format: Article
Language:English
Subjects:
Cohesion
Collision dynamics
Discrete element method
Drag
Equations of motion
Mathematical analysis
Physics
Settling
Shear flow
Simulation
Van der Waals forces
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Summary:In this study, the motions of particles and particle clusters in liquid were numerically simulated. The particles of two sizes (Dp=40μm and 20μm) settle while repeating cohesion and dispersion, and finally the sediment of particles are formed at the bottom of a hexahedron container which is filled up with pure water. The flow field was solved with the Navier-Stokes equations and the particle motions were solved with the Lagrangian-type motion equations, where the interaction between fluid and particles due to drag forces were taken into account. The collision among particles was calculated using Distinct Element Method (DEM), and the effects of cohesive forces by van der Waals force acting on particle contact points were taken into account. Numerical simulations were performed under conditions in still flow and in shear flow. It was found that the simulation results enable us to know the state of the particle settling and the particle condensation.
ISSN:1742-6596
1742-6588
1742-6596
DOI:10.1088/1742-6596/147/1/012072