Rheological response of nonspherical granular flows down an incline

R. C. Hidalgo, B. Szabó, K. Gillemot, T. Börzsönyi, T. Weinhart

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    20 Citations (Scopus)
    87 Downloads (Pure)

    Abstract

    We present an extensive numerical and experimental study, investigating a three-dimensional (3D) granular flow of elongated particles down an inclined plane. Similarly to sheared systems, the average particle orientation is found to enclose a small angle with the flow direction. In the bulk, this behavior is independent of the shear rate. At the surface, however, the particles move in more dilute conditions, and the average orientation strongly depends on the shear rate. A systematic numerical study varying the particle aspect ratio and the plane inclination reveals that the particle size perpendicular to the flow direction, deff, is an appropriate length scale to define an effective inertial number Ieff, which fully captures the impact of the particle shape on the system's rheology. Like in the case of spheres, density and friction result in well-defined functions of the effective inertial number Ieff. Thus, we quantify and explain the dependence of the rheological parameters on the aspect ratio, based on the micromechanical details.

    Original languageEnglish
    Article number074301
    JournalPhysical review fluids
    Volume7
    Issue number3
    DOIs
    Publication statusPublished - 3 Jul 2018

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