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Numerical analysis of contact electrification of non-spherical particles in a rotating drum

Pei, C, Pei, C, Wu, CY and Adams, M (2015) Numerical analysis of contact electrification of non-spherical particles in a rotating drum Powder Technology.

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Abstract

© 2015 Elsevier B.V. Contact electrification is generally referred to as the charge transfer process between particles during collisions. The transferred charge can be accumulated on the surface of the particles especially for insulating materials with irregular shapes, which can lead to a non-uniform charge distribution and eventually affects the charge accumulation process. In this study, in order to investigate the influence of the particle shape on contact electrification, a sphere-tree multi-sphere method and a contact electrification model are implemented into the discrete element method (DEM) to model the charging process of irregular particles in a rotating drum. Irregular particles with various Sauter mean diameters but the same maximum diameter and equivalent volume diameters are considered. The charge distribution and accumulation on the particles are investigated. It is found that the charge transfer originates from the contact between the particle and the drum due to the contact potential difference and initially takes place primarily at the region near the wall of the drum. The charge eventually propagates to the entire granular bed. The charge of the particles increases exponentially to an equilibrium value. For particles with the same maximum diameter, a larger charging coefficient is obtained for the particles with smaller Sauter mean diameters and sphericities, which leads to a faster charge accumulation, while for particles with the same equivalent volume diameter and fill ratio, similar charging coefficients are observed. A non-uniform intra-particle charge distribution is induced on each individual multi-sphere particle.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemical and Process Engineering
Authors :
AuthorsEmailORCID
Pei, CUNSPECIFIEDUNSPECIFIED
Pei, CUNSPECIFIEDUNSPECIFIED
Wu, CYUNSPECIFIEDUNSPECIFIED
Adams, MUNSPECIFIEDUNSPECIFIED
Date : 1 November 2015
Identification Number : 10.1016/j.powtec.2015.05.050
Additional Information : © 2015. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Depositing User : Symplectic Elements
Date Deposited : 20 Oct 2015 09:33
Last Modified : 01 Nov 2016 02:08
URI: http://epubs.surrey.ac.uk/id/eprint/808588

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