Cohesion-driven mixing and segregation of dry granular media

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

*Corresponding author for this work

    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

    @article{8b757abf62824af592051ed76ae0d647,
    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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    language = "English",
    volume = "9",
    journal = "Scientific reports",
    issn = "2045-2322",
    publisher = "Nature Publishing Group",

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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

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    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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