Many products in the chemical and agricultural industries are pelletized in the form of rod‐like particles that often have different aspect ratios. However, the flow, mixing, and segregation of non‐spherical particles such as rod‐like particles are poorly understood. Here, we use the discrete element method (DEM) utilizing super‐ellipsoid particles to simulate the flow and segregation of rod‐like particles differing in length but with the same diameter in a quasi‐2D one‐sided bounded heap. The DEM simulations accurately reproduce the segregation of size bidisperse rod‐like particles in a bounded heap based on comparison with experiments. Rod‐like particles orient themselves along the direction of flow, although bounding walls influence the orientation of the smaller aspect ratio particles. The flow kinematics and segregation of bidisperse rods having identical diameters but different lengths are similar to spherical particles. The segregation velocity of one rod species relative to the mean velocity depends linearly on the concentration of the other species, the shear rate, and a parameter based on the relative lengths of the rods. A continuum model developed for spherical particles that includes advection, diffusion, and segregation effects accurately predicts the segregation of rods in the flowing layer for a range of physical control parameters and particle species concentrations. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1550–1563, 2018

中文翻译：

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准2D有界堆流中分离杆的仿真和建模

化学和农业工业中的许多产品都是以棒状颗粒的形式制成颗粒，这些颗粒通常具有不同的长宽比。但是，人们对非球形颗粒（如棒状颗粒）的流动，混合和分离的了解却很少。在这里，我们使用离散元素方法（DEM），利用超椭球体颗粒模拟长度不同但直径相同的棒状颗粒在准2D单边有界堆中的流动和分离。根据与实验的比较，DEM模拟可以精确地再现大小堆中的双分散棒状颗粒的偏析。杆状粒子将自身沿流动方向定向，尽管边界壁会影响较小的长宽比粒子的定向。具有相同直径但不同长度的双分散棒的流动运动学和偏析类似于球形颗粒。一种棒物质的分离速度相对于平均速度的线性关系取决于另一种物质的浓度，剪切速率以及基于棒的相对长度的参数。针对球形粒子开发的包括对流，扩散和偏析效应的连续模型，可针对一系列物理控制参数和粒子种类浓度准确预测流动层中棒的偏析。©2017美国化学工程师学会 一种棒物质的分离速度相对于平均速度的线性关系取决于另一种物质的浓度，剪切速率以及基于棒的相对长度的参数。针对球形粒子开发的包括对流，扩散和偏析效应的连续模型，可针对一系列物理控制参数和粒子种类浓度准确预测流动层中棒的偏析。©2017美国化学工程师学会 一种棒物质的分离速度相对于平均速度的线性关系取决于另一种物质的浓度，剪切速率以及基于棒的相对长度的参数。针对球形粒子开发的包括对流，扩散和偏析效应的连续模型，可针对一系列物理控制参数和粒子种类浓度准确预测流动层中棒的偏析。©2017美国化学工程师学会AIChE J，64：1550–1563，2018