Numerical analysis of contact electrification using DEM–CFD

Chen, Pei; Wu, Chuan‐Yu; England, David E.; Byard, Stephen J.; Berchtold, Harald; Adams, M.J.

doi:10.1016/j.powtec.2013.04.014

Cited by 73 publications

(46 citation statements)

References 38 publications

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“…These effects play important roles in the charge transfer process. The contact electrification model in this DEM model is based on the primary sphere, which is similar to the model reported in Pei et al [13,20]. When a contact occurs, the charge can be transferred from one surface to another due to the total potential difference which can be expressed as:…”

Section: The Contact Electrification Modelmentioning

confidence: 88%

“…An exceptional case in this study is that the spherical particles (D 32 is treated as one sphere with a uniform charge distribution on the surface and the induced potential difference is determined by the uniform distribution [13]. However, the multisphere particle is treated as an assembly of primary spheres on which the non-uniform charge distribution is observed, as shown in Figure 18.…”

Section: The Intra-particle Charge Distribution 21mentioning

confidence: 99%

“…Based on the condenser model [2,13,32], the CPD (V c =V i -V j ) is the driving force for electron transfer between contacting surfaces. In each collision, the transferred charge is proportional to the maximum contact area and the total potential difference:…”

Section: The Contact Electrification Modelmentioning

confidence: 99%

“…The charge acquisition and distribution within the particle system, which are also called interparticle charge acquisition and distribution, were investigated experimentally and numerically [2,[12][13][14]. LaMarche et al [12] examined the charging process of dielectric particles flowing through a metal cylinder and showed that the net charge on the particles increased linearly with an increase in the contact surface area between the particles and the cylinder, while the net charge density of the powder was greater in the region close to the wall compared with that at the centre.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the discrete element method coupled with computational fluid dynamics (DEM-CFD) has been widely used to explore the physical and mechanical behaviours of each individual particle and subsequent bulk properties of the particle system. Pei et al [13] used the DEM-CFD implemented with a contact electrification (condenser) model to compute the charging process of particles in a fluidized bed. It was found that the electrostatic charge was initially generated after the impact between the particle and the container surfaces at side regions close to container surfaces due to different work functions between particles and container surfaces.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Adams

2015

Powder Technology

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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 ζ Presently with Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB3 0FS, UK * Corresponding author: Tel: 01483683506. Email: c.y.wu@surrey.ac.uk 2 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 lead 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.

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Section: The Contact Electrification Modelmentioning

confidence: 88%

Section: The Intra-particle Charge Distribution 21mentioning

confidence: 99%

Section: The Contact Electrification Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Chen

Adams

2015

Powder Technology

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The effects of dynamics on the triboelectrification of volcanic ash

Harper

Dufek

2016

JGR Atmospheres

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Lightning is often observed during explosive volcanic eruptions, and the charging processes associated with these displays have been attributed to several mechanisms. In this work we delineate a set of experiments designed to quantify silicate-based triboelectric charging in the volcanic context. Using natural samples from three different volcanoes, we show that the rate of triboelectrification in a fluidized bed depends on the energy input into the granular system. Experiments are conducted employing nonintrusive electrostatic sensors, ensuring that all charge exchange arises solely from particle-particle collisions. At higher fluidization energies, particles undergo more frequent and energetic collisions, facilitating the transfer of charge. This finding implies that triboelectric charging could help promote charging in regions of the eruptive system that contain numerous particle-particle collisions such as the conduit and gas thrust regions. Our experiments also suggest that surface charge density is capped, at least in part, by atmospheric conditions, specifically the breakdown characteristics of the gas.

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Interparticle Forces and External Fields

2016

Coupled CFD‐DEM Modeling

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Numerical analysis of contact electrification using DEM–CFD

Cited by 73 publications

References 38 publications

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

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

The effects of dynamics on the triboelectrification of volcanic ash

Interparticle Forces and External Fields

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