Browsing by Author "Goldberg, Ezequiel"

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    Effect of grain shape on the jamming of two dimensional silos
    (EPJ Web of Conferences, 2017) Goldberg, Ezequiel; Carlevaro, Manuel; Pugnaloni, Luis
    We present discrete element method simulations of the discharge of silos in two dimensions. We study the effect of the grain shape on the clogging of small apertures, considering regular polygons and disks of equal mass. In particular, we analyze the avalanche size distribution and the jamming probability for disks, triangles, squares, pentagons, hexagons and heptagons as a function of the aperture size. We show that the jamming probability presents a non-linear response as a function of the number of vertexes of the polygons.
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    Flow rate of polygonal grains through a bottleneck Interplay between shape and size
    (Papers in Physics, 2015) Goldberg, Ezequiel; Carlevaro, Manuel; Pugnaloni, Luis
    We report two-dimensional simulations of circular and polygonal grains passing through an aperture at the bottom of a silo. The mass flow rate for regular polygons is lower than for disks\red{,} as observed by other authors. We show that both the exit velocity of the grains and the packing fraction are lower for polygons, which leads to the reduced flow rate. We point out the importance of the criteria used to define when two objects of different shape are considered to be of the same size. Depending on this criteria, the mass flow rate may vary significantly for some polygons. Moreover, the particle flow rate is non-trivially related to a combination of mass flow rate, particle shape and particle size. For some polygons, the particle flow rate may be lower or higher than that of the corresponding disks depending on the size comparison criteria.