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Analysis of flowability of cohesive powders using Distinct Element Method

Moreno-Atanasio, R., Antony, S.J. and Ghadiri, M. (2005) Analysis of flowability of cohesive powders using Distinct Element Method. Powder Technology, 158 (1-3). pp. 51-57. ISSN 0032-5910

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Abstract

Computer simulations using Distinct Element Method (DEM) have been carried out to investigate the effect of cohesion on the flowability of polydisperse particulate systems. For this purpose, two assemblies with different values of surface energy and made of 3000 spheres with the mechanical properties of glass beads were considered. The analysis of the flowability of the powders is presented in terms of the unconfined yield stress as a function of strain rate for different pre-consolidation loads. For values of the surface energy of 1.0 J/m2 and strain rates lower than 6 s-1, the unconfined yield stress does not change significantly indicating a quasi-static behaviour of the particulate assemblies during the compression process. For larger strain rates, the unconfined yield stress varies with the power index of 1.2 of the strain rate. The influence of the pre-consolidating stress on the powder behaviour has also been investigated and a flow factor was obtained from the linear relationship between the unconfined yield stress and pre-consolidation stress. The computer simulations show qualitatively a good agreement with the experimental trends on highly cohesive powder flow behaviour.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 2005 Elsevier B.V. This is an author produced version of an article published in Powder Technology. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.
Keywords: flowability, cohesive powders, unconfined, yield stress, polydisperse, glass beads, Distinct Element Method
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Engineering (Leeds) > School of Process, Environmental and Materials Engineering (Leeds) > Institute for Particle Science and Engineering (Leeds)
Depositing User: Repository Officer
Date Deposited: 15 Mar 2006
Last Modified: 05 Jun 2014 05:43
Published Version: http://dx.doi.org/10.1016/j.powtec.2005.04.029
Status: Published
Refereed: Yes
Identification Number: 10.1016/j.powtec.2005.04.029
URI: http://eprints.whiterose.ac.uk/id/eprint/1103

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