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Lookup NU author(s): Dr Francisco KisukaORCiD, Dr Colin HareORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2023 The Author(s). Granular flows are characterised by particle interactions that involve sliding and collisions. In such events, heat is generated from friction and plastic deformation. Despite the importance of such self-heating mechanisms, our understanding of the fundamental principles of heat generation from friction and plastic dissipation is still limited. This work explores this problem at the particle level for oblique impacts between a spherical particle and a rigid substrate. In the first part, theoretical models and a finite element method (FEM) model are used to predict the amount of heat generated and contact temperatures at various impact angles. The theoretical and the FEM models are in good agreement for all impact cases considered. A parametric study of the influence on heat generation and temperature distributions is also carried out. It is shown that the temperature profiles are dependent not only on the amount of the generated heat but also on the material's thermal properties, such as thermal conductivity and specific head capacity. Apart from a good insight into heat generation during oblique impacts, this study also identifies simple theoretical solutions that can be used in other numerical tools, such as discrete element methods, for studying heat generation problems in bulk granular flows.
Author(s): Kisuka F, Hare C, Wu C-Y
Publication type: Article
Publication status: Published
Journal: Powder Technology
Year: 2023
Volume: 422
Print publication date: 15/05/2023
Online publication date: 23/03/2023
Acceptance date: 21/03/2023
Date deposited: 13/04/2023
ISSN (print): 0032-5910
ISSN (electronic): 1873-328X
Publisher: Elsevier BV
URL: https://doi.org/10.1016/j.powtec.2023.118481
DOI: 10.1016/j.powtec.2023.118481
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