Dynamics of discrete wet granular avalanches in a rotary drum

Jens H. Kasper *, Vanessa Magnanimo, Ahmed Jarray

*Corresponding author for this work

    Research output: Contribution to conferencePaper

    41 Downloads (Pure)

    Abstract

    The dynamic behavior of cohesive granular flows is important in geo-mechanics and industrial applications, yet poorly understood. We studied the effects of liquid viscosity and particle size on the dynamics of wet granular avalanches, occurring in a slowly rotating drum. A Discrete Element Method (DEM) model, in which contact forces and cohesive forces were considered, was employed to simulate this flow behavior. We found that the avalanche amplitude, flow layer velocity and granular temperature decrease as viscosity increases, but increase with particle size. Increasing the viscous forces causes the flow to behave as a bulk, pushing the free surface towards a convex shape, and avalanches become less pronounced. We found that this transition from avalanching flow to continuous flow can be characterized by evaluating the local fluctuations of the surface angle.
    Original languageEnglish
    Pages1
    Number of pages10
    Publication statusPublished - 1 Jul 2019
    Event8th International Conference on Discrete Element Methods, DEM 2019 - University of Twente, Waaier building, Enschede, Netherlands
    Duration: 21 Jul 201926 Jul 2019
    Conference number: 8
    https://mercurylab.co.uk/dem8/

    Conference

    Conference8th International Conference on Discrete Element Methods, DEM 2019
    Abbreviated titleDEM 2019
    CountryNetherlands
    CityEnschede
    Period21/07/1926/07/19
    Internet address

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    drums
    avalanches
    viscosity
    pushing
    causes
    liquids

    Keywords

    • Granular Materials
    • Granular Avalanche
    • Liquid Induced Cohesion
    • Rotary Drum
    • DEM

    Cite this

    Kasper , J. H., Magnanimo, V., & Jarray, A. (2019). Dynamics of discrete wet granular avalanches in a rotary drum. 1. Paper presented at 8th International Conference on Discrete Element Methods, DEM 2019, Enschede, Netherlands.
    Kasper , Jens H. ; Magnanimo, Vanessa ; Jarray, Ahmed . / Dynamics of discrete wet granular avalanches in a rotary drum. Paper presented at 8th International Conference on Discrete Element Methods, DEM 2019, Enschede, Netherlands.10 p.
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    keywords = "Granular Materials, Granular Avalanche, Liquid Induced Cohesion, Rotary Drum, DEM",
    author = "Kasper, {Jens H.} and Vanessa Magnanimo and Ahmed Jarray",
    year = "2019",
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    day = "1",
    language = "English",
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    Kasper , JH, Magnanimo, V & Jarray, A 2019, 'Dynamics of discrete wet granular avalanches in a rotary drum' Paper presented at 8th International Conference on Discrete Element Methods, DEM 2019, Enschede, Netherlands, 21/07/19 - 26/07/19, pp. 1.

    Dynamics of discrete wet granular avalanches in a rotary drum. / Kasper , Jens H.; Magnanimo, Vanessa ; Jarray, Ahmed .

    2019. 1 Paper presented at 8th International Conference on Discrete Element Methods, DEM 2019, Enschede, Netherlands.

    Research output: Contribution to conferencePaper

    TY - CONF

    T1 - Dynamics of discrete wet granular avalanches in a rotary drum

    AU - Kasper , Jens H.

    AU - Magnanimo, Vanessa

    AU - Jarray, Ahmed

    PY - 2019/7/1

    Y1 - 2019/7/1

    N2 - The dynamic behavior of cohesive granular flows is important in geo-mechanics and industrial applications, yet poorly understood. We studied the effects of liquid viscosity and particle size on the dynamics of wet granular avalanches, occurring in a slowly rotating drum. A Discrete Element Method (DEM) model, in which contact forces and cohesive forces were considered, was employed to simulate this flow behavior. We found that the avalanche amplitude, flow layer velocity and granular temperature decrease as viscosity increases, but increase with particle size. Increasing the viscous forces causes the flow to behave as a bulk, pushing the free surface towards a convex shape, and avalanches become less pronounced. We found that this transition from avalanching flow to continuous flow can be characterized by evaluating the local fluctuations of the surface angle.

    AB - The dynamic behavior of cohesive granular flows is important in geo-mechanics and industrial applications, yet poorly understood. We studied the effects of liquid viscosity and particle size on the dynamics of wet granular avalanches, occurring in a slowly rotating drum. A Discrete Element Method (DEM) model, in which contact forces and cohesive forces were considered, was employed to simulate this flow behavior. We found that the avalanche amplitude, flow layer velocity and granular temperature decrease as viscosity increases, but increase with particle size. Increasing the viscous forces causes the flow to behave as a bulk, pushing the free surface towards a convex shape, and avalanches become less pronounced. We found that this transition from avalanching flow to continuous flow can be characterized by evaluating the local fluctuations of the surface angle.

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    KW - Granular Avalanche

    KW - Liquid Induced Cohesion

    KW - Rotary Drum

    KW - DEM

    M3 - Paper

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    Kasper JH, Magnanimo V, Jarray A. Dynamics of discrete wet granular avalanches in a rotary drum. 2019. Paper presented at 8th International Conference on Discrete Element Methods, DEM 2019, Enschede, Netherlands.