Dynamic simulation of non-spherical particulate suspensions |
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Authors: | Prakorn Kittipoomwong Howard See Nam Mai-Duy |
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Institution: | (1) School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, New South Wales, 2006, Australia;(2) Faculty of Engineering and Surveying, University of Southern Queensland, Toowoomba, Queensland, 4350, Australia |
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Abstract: | Particle-level simulation has been employed to investigate rheology and microstructure of non-spherical particulate suspensions
in a simple shear flow. Non-spherical particles in Newtonian fluids are modeled as three-dimensional clusters of neutrally
buoyant, non-Brownian spheres linked together by Hookean-type constraint force. Rotne–Prager correction to velocity disturbance
has been employed to account for far-field hydrodynamic interactions. An isolated rod-like particle in simple shear flow exhibits
a periodic orientation distribution, commonly referred to as Jeffery orbit. Lubrication-like repulsive potential between clusters
have been included in simulation of rod-like suspensions at various aspect ratios over dilute to semi-dilute volume fractions.
Shear viscosity evaluated by orientation distribution qualitatively agrees with one obtained by direct computation of shear
stress. |
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