Cohesion-driven mixing and segregation of dry granular media

Ahmed Jarray, Hao Shi, Bert J. Scheper, Mehdi Habibi, Stefan Luding

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

Granular segregation is a common, yet still puzzling, phenomenon encountered in many natural and engineering processes. Here, we experimentally investigate the effect of particles cohesion on segregation in dry monodisperse and bidisperse systems using a rotating drum mixer. Chemical silanization, glass surface functionalization via a Silane coupling agent, is used to produce cohesive dry glass particles. The cohesive force between the particles is controlled by varying the reaction duration of the silanization process, and is measured using an in-house device specifically designed for this study. The effects of the cohesive force on flow and segregation are then explored and discussed. For monosized particulate systems, while cohesionless particles perfectly mix when tumbled, highly cohesive particles segregate. For bidisperse mixtures of particles, an adequate cohesion-tuning reduces segregation and enhances mixing. Based on these results, a simple scheme is proposed to describe the system's mixing behaviour with important implications for the control of segregation or mixing in particulate industrial processes.

Original languageEnglish
Article number13480
Number of pages12
JournalScientific reports
Volume9
DOIs
Publication statusE-pub ahead of print/First online - 17 Sep 2019

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Glass
Silanes
Equipment and Supplies

Keywords

  • Segregation
  • Granular materials
  • Cohesion
  • Rheology
  • Rotating drum
  • Granular flow
  • Silanization

Cite this

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title = "Cohesion-driven mixing and segregation of dry granular media",
abstract = "Granular segregation is a common, yet still puzzling, phenomenon encountered in many natural and engineering processes. Here, we experimentally investigate the effect of particles cohesion on segregation in dry monodisperse and bidisperse systems using a rotating drum mixer. Chemical silanization, glass surface functionalization via a Silane coupling agent, is used to produce cohesive dry glass particles. The cohesive force between the particles is controlled by varying the reaction duration of the silanization process, and is measured using an in-house device specifically designed for this study. The effects of the cohesive force on flow and segregation are then explored and discussed. For monosized particulate systems, while cohesionless particles perfectly mix when tumbled, highly cohesive particles segregate. For bidisperse mixtures of particles, an adequate cohesion-tuning reduces segregation and enhances mixing. Based on these results, a simple scheme is proposed to describe the system's mixing behaviour with important implications for the control of segregation or mixing in particulate industrial processes.",
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Cohesion-driven mixing and segregation of dry granular media. / Jarray, Ahmed; Shi, Hao; Scheper, Bert J.; Habibi, Mehdi; Luding, Stefan.

In: Scientific reports, Vol. 9, 13480, 17.09.2019.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Cohesion-driven mixing and segregation of dry granular media

AU - Jarray, Ahmed

AU - Shi, Hao

AU - Scheper, Bert J.

AU - Habibi, Mehdi

AU - Luding, Stefan

PY - 2019/9/17

Y1 - 2019/9/17

N2 - Granular segregation is a common, yet still puzzling, phenomenon encountered in many natural and engineering processes. Here, we experimentally investigate the effect of particles cohesion on segregation in dry monodisperse and bidisperse systems using a rotating drum mixer. Chemical silanization, glass surface functionalization via a Silane coupling agent, is used to produce cohesive dry glass particles. The cohesive force between the particles is controlled by varying the reaction duration of the silanization process, and is measured using an in-house device specifically designed for this study. The effects of the cohesive force on flow and segregation are then explored and discussed. For monosized particulate systems, while cohesionless particles perfectly mix when tumbled, highly cohesive particles segregate. For bidisperse mixtures of particles, an adequate cohesion-tuning reduces segregation and enhances mixing. Based on these results, a simple scheme is proposed to describe the system's mixing behaviour with important implications for the control of segregation or mixing in particulate industrial processes.

AB - Granular segregation is a common, yet still puzzling, phenomenon encountered in many natural and engineering processes. Here, we experimentally investigate the effect of particles cohesion on segregation in dry monodisperse and bidisperse systems using a rotating drum mixer. Chemical silanization, glass surface functionalization via a Silane coupling agent, is used to produce cohesive dry glass particles. The cohesive force between the particles is controlled by varying the reaction duration of the silanization process, and is measured using an in-house device specifically designed for this study. The effects of the cohesive force on flow and segregation are then explored and discussed. For monosized particulate systems, while cohesionless particles perfectly mix when tumbled, highly cohesive particles segregate. For bidisperse mixtures of particles, an adequate cohesion-tuning reduces segregation and enhances mixing. Based on these results, a simple scheme is proposed to describe the system's mixing behaviour with important implications for the control of segregation or mixing in particulate industrial processes.

KW - Segregation

KW - Granular materials

KW - Cohesion

KW - Rheology

KW - Rotating drum

KW - Granular flow

KW - Silanization

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