Heat transfer modelling in Discrete Element Method (DEM)-based simulations of thermal processes: Theory and model development
Heat transfer modelling in Discrete Element Method (DEM)-based simulations of thermal processes: Theory and model development
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DOI：
10.1016/j.pecs.2020.100847
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发表时间：
2020-07
影响因子：
29.5
通讯作者：
Z. Peng;E. Doroodchi;B. Moghtaderi
中科院分区：
文献类型：
--
作者：
Z. Peng;E. Doroodchi;B. Moghtaderi
在过去的十年中，基于DEM的模拟已经成为一个有前途的替代物理测量的热颗粒系统。尽管他们的快速发展和成功的应用范围广泛的工业过程中，一个全面的审查的理论基础的热DEM为基础的模拟尚未进行。这项工作提出了一个关键的和深入的审查所有主要的热模型和传热机制有关的DEM为基础的模拟。本文还对常被忽略的边界条件和粒子体温度分布等关键问题进行了总结和讨论，旨在为基于DEM的热传导模型的发展提供一条清晰的道路。基于赫兹接触理论的准解析解是经典的，至今仍是求解静态接触传导的主要方法。最近的尝试主要针对改进通过碰撞接触和颗粒之间间隙液的薄楔进行的传导计算。1981年以前开发的经验关联式在计算流体-颗粒对流系数中仍然占主导地位。虽然更准确，辐射的离散模型，依赖于各个粒子之间的视图因子的解决方案已被应用得比连续模型少得多，由于显着的计算开销。一般来说，以前的努力已经导致了一个坚实的框架的热DEM为基础的模型的建设。需要大量的工作来改进现有的或开发新的传热子模型，特别是那些在粒子负载系统中的传导和辐射的准确和有效的建模。
Over the past decade, DEM-based simulation has become a promising alternative to physical measurements of thermal particulate systems. Despite their rapid advancement and successful applications to a wide range of industrial processes, a comprehensive review of the theory that underpins the thermal DEM-based simulations is yet to be conducted. This work presents a critical and in-depth review of all major thermal models and heat transfer mechanisms pertinent to DEM-based simulations. Other critical aspects such as boundary conditions and particle body temperature distribution that were often overlooked are also summarised and discussed, aiming to provide a clear path for the development of robust thermal DEM-based models.The quasi-analytical solution based on the Hertzian contact theory proves classic and remains the main method to solving the conduction of static contacts. Recent attempts have been mainly directed towards improving the calculation of conduction through collisional contacts and the thin wedge of interstitial fluid between particles. Empirical correlations that were developed before 1981 remain predominant in calculating the fluid-particle convection coefficient. Though more accurate, the discrete models of radiation that rely on the solution of view factors amongst individual particles have been applied much less than the continuum models due to the significant computational overhead. Generally, previous efforts have led to the construction of a solid framework of thermal DEM-based models. Significant work is required to improve existing or develop new heat transfer sub-models, particularly those for accurate and efficient modelling of conduction and radiation in particle-laden systems.