DEM Simulation of Particle Stratification and Segregation in Stockpile Formation

Dizhe Zhang, Zongyan Zhou, David Pinson

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

Abstract

Granular stockpiles are commonly observed in nature and industry, and their formation has been extensively investigated experimentally and mathematically in the literature. One of the striking features affecting properties of stockpiles are the internal patterns formed by the stratification and segregation processes. In this work, we conduct a numerical study based on DEM (discrete element method) model to study the influencing factors and triggering mechanisms of these two phenomena. With the use of a previously developed mixing index, the effects of parameters including size ratio, injection height and mass ratio are investigated. We found that it is a void-filling mechanism that differentiates the motions of particles with different sizes. This mechanism drives the large particles to flow over the pile surface and segregate at the pile bottom, while it also pushes small particles to fill the voids between large particles, giving rise to separate layers. Consequently, this difference in motion will result in the observed stratification and segregation phenomena.

Original languageEnglish
Title of host publicationEPJ Web of Conferences
Subtitle of host publicationPowders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media
EditorsFarhang Radjai, Saeid Nezamabadi, Stefan Luding, Jean-Yves Delenne
Place of PublicationLes Ulis France
PublisherEDP Sciences
Number of pages4
Volume140
DOIs
Publication statusPublished - 30 Jun 2017
EventPowders and Grains 2017 - Montpellier, France
Duration: 3 Jul 20177 Jul 2017
Conference number: 8th
http://pg2017.org/en/

Publication series

NameEPJ Web of Conferences
PublisherEDP Sciences
Volume140
ISSN (Electronic)2100-014X

Conference

ConferencePowders and Grains 2017
CountryFrance
CityMontpellier
Period3/07/177/07/17
Internet address

Keywords

  • DEM
  • Segregation
  • Stockpile
  • Stratification

Cite this

Zhang, D., Zhou, Z., & Pinson, D. (2017). DEM Simulation of Particle Stratification and Segregation in Stockpile Formation. In F. Radjai, S. Nezamabadi, S. Luding, & J-Y. Delenne (Eds.), EPJ Web of Conferences : Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media (Vol. 140). [15018] (EPJ Web of Conferences ; Vol. 140). Les Ulis France: EDP Sciences. EPJ Web of Conferences https://doi.org/10.1051/epjconf/201714015018
Zhang, Dizhe ; Zhou, Zongyan ; Pinson, David. / DEM Simulation of Particle Stratification and Segregation in Stockpile Formation. EPJ Web of Conferences : Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. editor / Farhang Radjai ; Saeid Nezamabadi ; Stefan Luding ; Jean-Yves Delenne. Vol. 140 Les Ulis France : EDP Sciences, 2017. (EPJ Web of Conferences ). (EPJ Web of Conferences).
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abstract = "Granular stockpiles are commonly observed in nature and industry, and their formation has been extensively investigated experimentally and mathematically in the literature. One of the striking features affecting properties of stockpiles are the internal patterns formed by the stratification and segregation processes. In this work, we conduct a numerical study based on DEM (discrete element method) model to study the influencing factors and triggering mechanisms of these two phenomena. With the use of a previously developed mixing index, the effects of parameters including size ratio, injection height and mass ratio are investigated. We found that it is a void-filling mechanism that differentiates the motions of particles with different sizes. This mechanism drives the large particles to flow over the pile surface and segregate at the pile bottom, while it also pushes small particles to fill the voids between large particles, giving rise to separate layers. Consequently, this difference in motion will result in the observed stratification and segregation phenomena.",
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Zhang, D, Zhou, Z & Pinson, D 2017, DEM Simulation of Particle Stratification and Segregation in Stockpile Formation. in F Radjai, S Nezamabadi, S Luding & J-Y Delenne (eds), EPJ Web of Conferences : Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. vol. 140, 15018, EPJ Web of Conferences , vol. 140, EDP Sciences, Les Ulis France, EPJ Web of Conferences, Powders and Grains 2017, Montpellier, France, 3/07/17. https://doi.org/10.1051/epjconf/201714015018

DEM Simulation of Particle Stratification and Segregation in Stockpile Formation. / Zhang, Dizhe; Zhou, Zongyan; Pinson, David.

EPJ Web of Conferences : Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. ed. / Farhang Radjai; Saeid Nezamabadi; Stefan Luding; Jean-Yves Delenne. Vol. 140 Les Ulis France : EDP Sciences, 2017. 15018 (EPJ Web of Conferences ; Vol. 140).

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

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N2 - Granular stockpiles are commonly observed in nature and industry, and their formation has been extensively investigated experimentally and mathematically in the literature. One of the striking features affecting properties of stockpiles are the internal patterns formed by the stratification and segregation processes. In this work, we conduct a numerical study based on DEM (discrete element method) model to study the influencing factors and triggering mechanisms of these two phenomena. With the use of a previously developed mixing index, the effects of parameters including size ratio, injection height and mass ratio are investigated. We found that it is a void-filling mechanism that differentiates the motions of particles with different sizes. This mechanism drives the large particles to flow over the pile surface and segregate at the pile bottom, while it also pushes small particles to fill the voids between large particles, giving rise to separate layers. Consequently, this difference in motion will result in the observed stratification and segregation phenomena.

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Zhang D, Zhou Z, Pinson D. DEM Simulation of Particle Stratification and Segregation in Stockpile Formation. In Radjai F, Nezamabadi S, Luding S, Delenne J-Y, editors, EPJ Web of Conferences : Powders and Grains 2017 – 8th International Conference on Micromechanics on Granular Media. Vol. 140. Les Ulis France: EDP Sciences. 2017. 15018. (EPJ Web of Conferences ). (EPJ Web of Conferences). https://doi.org/10.1051/epjconf/201714015018