Abstract A three-dimensional numerical simulation of the motion – heat-transfer coupling characteristics of waste tyre particles in a rotary kiln at 773–973 K was performed in this study. The particle dynamics and heat transfer characteristics were solved on a Lagrange grid. The motion model considered particle collisions using a nonslip collision model. Based on the particle motion results obtained, we considered three heat transfer mechanisms: particle–particle collision heat conduction, wall–particle radiation heat transfer, and wall–particle collision heat conduction. Subsequently, we established a mathematical model wherein the heat transfer associated with a particle is determined by its position in each time step, and implemented it on a JAVA platform to perform calculations. Finally, we obtained the temperature of each particle at each moment in the entire process. Further analysis of the simulation results shows that the average temperature and temperature standard deviation is governed by the wall temperature, rotation speed, and particle size. Highlights Particle heat transfer in a rotary kiln is studied based on the Lagrange theory. A criterion to judge the heat transfer of movement particle is reported herein. The temperature of each particle at each moment in the entire process is obtained.

中文翻译：

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基于离散元法的回转窑大颗粒运动-传热耦合特性建模

摘要 本研究对回转窑中废轮胎颗粒在 773-973 K 下的运动-传热耦合特性进行了三维数值模拟。粒子动力学和传热特性在拉格朗日网格上求解。运动模型使用防滑碰撞模型来考虑粒子碰撞。基于获得的粒子运动结果，我们考虑了三种传热机制：粒子-粒子碰撞热传导、壁-粒子辐射传热和壁-粒子碰撞热传导。随后，我们建立了一个数学模型，其中与粒子相关的传热由其在每个时间步的位置确定，并在 JAVA 平台上实现进行计算。最后，我们获得了整个过程中每个时刻每个粒子的温度。对模拟结果的进一步分析表明，平均温度和温度标准偏差受壁温、转速和粒度的影响。亮点 基于拉格朗日理论研究了回转窑中的颗粒传热。本文报道了判断运动粒子传热的标准。得到整个过程中每个时刻每个粒子的温度。本文报道了判断运动粒子传热的标准。得到整个过程中每个时刻每个粒子的温度。本文报道了判断运动粒子传热的标准。得到整个过程中每个时刻每个粒子的温度。