Scott, L, Borissova, A, Burns, A et al. (1 more author) (2020) Influence of holdup on gas and particle flow patterns in a spiral jet mill. Powder Technology. ISSN 0032-5910
Abstract
Particle size reduction in spiral jet mills is induced by high velocity gas jets, causing interparticle and particle wall collisions leading to breakage. Despite extensive research on the design and operational parameters, the underlying mechanics of size reduction is still poorly understood. Discrete Element Method and Computational Fluid Dynamics are used here to analyse particle and fluid motions. A fast shearing dense particle bed is formed on the wall, with a transition to lean phase towards the centre of the mill. This necessitates four-way coupling of fluid and particle interactions for analysis. It is shown that increasing the depth of the particle bed reduces the fluid phase tangential velocity in the proximity of the classifier, as momentum is exchanged with circulating particles. The energy dissipation through particle collisions occurs mainly along the bed surface and in front of the grinding jet nozzles.
Metadata
Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2020, Elsevier. All rights reserved. This is an author produced version of an article published in Powder Technology. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Discrete element method; Spiral jet mill; Holdup; Dissipated energy |
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) |
Depositing User: | Symplectic Publications |
Date Deposited: | 09 Sep 2020 14:08 |
Last Modified: | 03 Sep 2021 00:40 |
Status: | Published online |
Publisher: | Elsevier |
Identification Number: | https://doi.org/10.1016/j.powtec.2020.08.099 |