Njobuenwu, DO orcid.org/0000-0001-6606-1912 and Fairweather, M (2017) Simulation of deterministic energy-balance particle agglomeration in turbulent liquid-solid flows. Physics of Fluids, 29 (8). 083301. ISSN 1070-6631
Abstract
An efficient technique to simulate turbulent particle-laden flow at high mass loadings within the four-way coupled simulation regime is presented. The technique implements large-eddy simulation, discrete particle simulation, a deterministic treatment of inter-particle collisions, and an energy-balanced particle agglomeration model. The algorithm to detect inter-particle collisions is such that the computational costs scale linearly with the number of particles present in the computational domain. On detection of a collision, particle agglomeration is tested based on the pre-collision kinetic energy, restitution coefficient, and van der Waals’ interactions. The performance of the technique developed is tested by performing parametric studies on the influence of the restitution coefficient (en = 0.2, 0.4, 0.6, and 0.8), particle size (dp = 60, 120, 200, and 316 μm), Reynolds number (Reτ = 150, 300, and 590), and particle concentration (αp = 5.0 × 10−4, 1.0 × 10−3, and 5.0 × 10−3) on particle-particle interaction events (collision and agglomeration). The results demonstrate that the collision frequency shows a linear dependency on the restitution coefficient, while the agglomeration rate shows an inverse dependence. Collisions among smaller particles are more frequent and efficient in forming agglomerates than those of coarser particles. The particle-particle interaction events show a strong dependency on the shear Reynolds number Reτ, while increasing the particle concentration effectively enhances particle collision and agglomeration whilst having only a minor influence on the agglomeration rate. Overall, the sensitivity of the particle-particle interaction events to the selected simulation parameters is found to influence the population and distribution of the primary particles and agglomerates formed.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017, The Authors. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Fluids 29, 083301 (2017) and may be found at https://doi.org/10.1063/1.4997089. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Large-eddy simulation, discrete particle simulation, hard-sphere collision, agglomeration, turbulent flow, particle-particle interactions, van der Waals’ interaction |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemical & Process Engineering (Leeds) |
Funding Information: | Funder Grant number EPSRC EP/L014041/1 |
Depositing User: | Symplectic Publications |
Date Deposited: | 08 Aug 2017 10:34 |
Last Modified: | 03 Aug 2019 05:46 |
Status: | Published |
Publisher: | American Institute of Physics |
Identification Number: | 10.1063/1.4997089 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:119882 |