Lattice Boltzmann simulation of particles agglomeration and rheology in a particulate flow |
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Authors: | Mandana Samari Kermani Ned Djilali Saeed Jafari Ebrahim Jahanshahi Javaran |
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Affiliation: | 1. Mechanical Engineering Department, Shahid Bahonar University of Kerman, Kerman, Iran;2. Mechanical Engineering Department, University of Victoria, Victoria, BC, Canada;3. Petrolium Engineering Department, Shahid Bahonar University of Kerman, Kerman, Iran;4. Department of Energy, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran |
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Abstract: | The dynamics and rheology of particles in a Newtonian fluid subjected to shear are simulated using Lattice Boltzmann Method. A computationally-efficient Smoothed Profile Method is used to resolve fluid-solid interactions, and the Lennard-Jones inter-particle potential is implemented to account for inter-particle forces. The use of a bi-periodic computational domain with Lees-Edward boundary conditions allows simulation for systems consisting of a large number of particles under shear. The method is validated for single and dual particle problems and an analysis is performed for multi-particle problems under a range of shear rates and particle fractions. The introduction of particle-particle interactions, which are physically important in many engineering processes, is found to have a considerable impact on the dynamics, agglomeration and rheology. The total stress exhibits high unsteadiness primarily due to the solid component contribution, at higher particle fractions. The simulations underscore the complex interplay between shear, interparticle forces and agglomeration and the complex dependencies of the rheological properties. |
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Keywords: | Lattice-Boltzmann method Lees-Edwards boundary condition particles agglomeration particulate flow smoothed profile method |
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