Discrete Element Method simulations of Homogeneous Cooling Systems (HCS) are used to develop a collisional dissipation rate model for non-spherical particle systems that can be incorporated in a two-fluid multiphase flow framework. Two types of frictionless, elongated particle models are compared in the HCS simulations: glued-sphere and true cylinder. Simulation results show that the ratio of translational to rotational granular temperatures is equal to one for the true cylindrical particles with particle aspect ratios (AR) greater than one and glued-sphere particles with AR >1.5, while the temperature ratio is less than one for glued-sphere particles with 1 < AR <1.5. The total collisional dissipation rate, which is associated with both translational and rotational granular temperature change rates, increases linearly with the particle aspect ratio. Thus, a collisional dissipation rate model for the elongated cylinders is developed by a simple modification of the existing spherical particle model. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译：

---

使用离散元素方法建立包含颗粒形状的碰撞耗散率模型

均相冷却系统（HCS）的离散元方法模拟用于为非球形粒子系统开发碰撞耗散率模型，该模型可以合并到两流体多相流框架中。在HCS模拟中比较了两种类型的无摩擦细长粒子模型：胶球和真实圆柱体。仿真结果表明，对于颗粒长宽比（AR）大于1的真圆柱形颗粒和AR> 1.5的胶球颗粒，平移和旋转颗粒温度之比等于1，而对于大于1的胶状球形颗粒，其平移与旋转颗粒温度之比等于1。 1 <AR <1.5的胶球颗粒。总碰撞耗散率与平移和旋转颗粒温度变化率相关，随着粒子长宽比线性增加。因此，通过简单修改现有的球形粒子模型，可以开发出细长圆柱体的碰撞耗散率模型。©2017美国化学工程师学会AIChE的Ĵ，2017年