This study is aimed at unveiling the influence of binary mixtures of nonspherical particles on hopper discharge behavior, which remains poorly understood. The discrete element method (DEM) is employed to simulate seven particle types with aspect ratios between 0 and 2 (namely, a sphere, two ellipsoids, two cylinders, and two cuboids) with the same volume. Seven monodisperse systems and twelve binary‐shape mixtures are assessed. For the monodisperse systems, particle shape is the dominant factor dictating discharge rate, compared to other factors like aspect ratio, preferential orientation, and packing. Regarding the binary‐shape mixtures, the discharge rates are similar for all twelve mixtures, reflecting a surprising lack of shape effects, which in turn means the negligible impact of solid volume fraction, aspect ratio, and segregation extent. Moreover, collision force is generally negatively correlated with discharge rate.

中文翻译：

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非球形颗粒二元混合物料斗排放行为的离散元方法研究

这项研究的目的是揭示非球形颗粒的二元混合物对料斗排放行为的影响，这一点仍然知之甚少。离散元素法（DEM）用于模拟7种纵横比在0和2之间的粒子类型（即，一个球体，两个椭圆体，两个圆柱体和两个长方体），并且体积相同。评估了七个单分散系统和十二个二元形状的混合物。对于单分散体系，与长宽比，优先取向和堆积等其他因素相比，颗粒形状是决定放电速率的主要因素。对于二元形状的混合物，所有十二种混合物的排放速率均相似，反映出形状效应出乎意料的缺乏，这反过来意味着固体体积分数，纵横比和偏析程度的影响可忽略不计。