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DEM-PBM Modelling Of Impact Dominated Ribbon Milling

Loreti, Simone, Wu, Chuan-Yu, Reynolds, G, Mirtič, A and Seville, Jonathan (2017) DEM-PBM Modelling Of Impact Dominated Ribbon Milling AIChE Journal, 63 (9). pp. 3692-3705.

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Ribbon milling is a critical step in dry granulation using roll compaction as it determines the properties of granules, and subsequently the properties of final products. During ribbon milling, fragmentation of ribbons or flakes (i.e. compressed agglomerates from dry powders) are induced by either impact or abrasion. Understanding these fragmentation mechanisms is critical in optimising ribbon milling processes. In the current study, the discrete element method (DEM) was used to model fragmentation at the microscopic level, providing a detailed insight into the underlying breakage mechanism. In DEM modelling, virtual ribbons were created by introducing an appropriate interfacial energy using the cohesive particle model. A set of three-dimensional parallelepiped ribbons with solid fraction φ=0.7422 and surface energies ranging from γ=0.03 J⁄m^2 and γ=2 J⁄m^2 were created and then fractured during impacts with a plane at various impact velocities, in order to model impact dominated milling. The fragmentation rate, and the number and size of fragments (i.e. granules) resulting from the breakage of a ribbon during the impact were determined. The DEM simulations showed that the granules size distribution had a bimodal pattern and there was a strong correlation between the size of fines generated from fragmentation during impact and the size of the feed powder (i.e. the size of the primary particles in this study), which was consistent with the observation from physical experiments. Two quantities were calculated from the DEM simulations: the number of fragments p and the fraction of fines z for each breakage event which can be used as input parameters for population balance models (PBM) to develop a DEM-PBM modelling framework.

Item Type: Article
Subjects : Chemical & Process Engineering
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
Reynolds, G
Mirtič, A
Date : 14 April 2017
DOI : 10.1002/aic.15721
Copyright Disclaimer : This is the peer reviewed version of the following article: Loreti, S., Wu, C.-Y., Reynolds, G., Mirtič, A. and Seville, J. (2017), DEM–PBM modeling of impact dominated ribbon milling. AIChE J., 63: 3692–3705. doi:10.1002/aic.15721, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving
Uncontrolled Keywords : Fragmentation; DEM-PBM; Ribbon Milling; Impact; Agglomerate; Dry Granulation.
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 22 Mar 2017 17:46
Last Modified : 16 Jan 2019 17:13

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