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The Impact of Discrete Element Method Parameters on Realistic Representation of Spherical Particles in a Packed Bed
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-8360-9051
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.ORCID iD: 0000-0001-6081-5736
2024 (English)In: Processes, E-ISSN 2227-9717, Vol. 12, no 1, article id 183Article in journal (Refereed) Published
Abstract [en]

Packed bed reactors play a crucial role in various industrial applications. This paper utilizes the Discrete Element Method (DEM), an efficient numerical technique for simulating the behavior of packed beds of particles as discrete phases. The focus is on generating densely packed particle beds. To ensure the model accuracy, specific DEM parameters were studied, including sub-step and rolling resistance. The analysis of the packed bed model extended to a detailed exploration of void fraction distribution along radial and vertical directions, considering the impact of wall interactions. Three different samples, spanning particle sizes from 0.3 mm to 6 mm, were used. Results indicated that the number of sub-steps significantly influences void fraction precision, a key criterion for comparing simulations with experimental results. Additionally, the study found that both loosely and densely packed beds of particles could be accurately represented by incorporating appropriate values for rolling friction. This value serves as an indicator of both inter-particle friction and friction between particles and the walls. An optimal rolling friction coefficient has been thereby suggested for the precise representation for the densely packed bed of spherical char particles.

Place, publisher, year, edition, pages
MDPI, 2024. Vol. 12, no 1, article id 183
Keywords [en]
packed bed, discrete element method, rolling friction, void fraction, sub-steps, wall effect
National Category
Fluid Mechanics and Acoustics Energy Engineering
Research subject
Energy Engineering; Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-103794DOI: 10.3390/pr12010183ISI: 001151320700001Scopus ID: 2-s2.0-85183389688OAI: oai:DiVA.org:ltu-103794DiVA, id: diva2:1828911
Funder
Swedish Energy Agency, P46974-1
Note

Validerad;2024;Nivå 2;2024-01-17 (joosat);

Full text: CC BY 4.0 License

Available from: 2024-01-17 Created: 2024-01-17 Last updated: 2024-03-12Bibliographically approved

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Ghasemi Monfared, ZahraHellström, J. Gunnar I.Umeki, Kentaro

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