A numerical and experimental study of batch sedimentation and viscous resuspension
| Autor: | Amy Cha-Tien Sun, Lisa Ann Mondy, S. A. Altobelli, Rekha Ranjana Rao |
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| Rok vydání: | 2002 |
| Předmět: |
Buoyancy
business.industry Applied Mathematics Mechanical Engineering Computational Mechanics Mechanics Computational fluid dynamics engineering.material Finite element method Computer Science Applications Physics::Fluid Dynamics Classical mechanics Mechanics of Materials engineering Initial value problem Streamlines streaklines and pathlines Two-phase flow business Shear flow Couette flow Mathematics |
| Zdroj: | International Journal for Numerical Methods in Fluids. 39:465-483 |
| ISSN: | 1097-0363 0271-2091 |
| DOI: | 10.1002/fld.246 |
| Popis: | A suspension of non-neutrally buoyant, large, nearly monodisperse spheres is studied both in batch sedimentation and in shear between concentric rotating cylinders. We apply a continuum constitutive equation based on the diffusive flux model augmented with buoyancy terms derived by Acrivos and coworkers and discretize the resulting equation set with the finite element method. We simulate batch sedimentation using this method and obtain a reasonable match with experiment. Next used two-dimensional NMR imaging to measure the evolution of solid fraction profiles in the same suspension undergoing flow between rotating concentric cylinders with two different initial conditions. Here, both gravity-induced and shear-induced particle migration are significant. Under these conditions, we have found that simulating the correct initial condition is critical to matching the experimental results. When this is done, the model results compare well with the experiments. Copyright © 2002 John Wiley & Sons, Ltd. |
| Databáze: | OpenAIRE |
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