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

    2 Citations (Scopus)
    23 Downloads (Pure)

    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
    Early online date17 Sep 2019
    DOIs
    Publication statusPublished - 1 Dec 2019

    Keywords

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

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