Abstract The eXtended Discrete Element Method (XDEM) platform which is a Coupled Eulerian-Lagrangian framework with heat and mass transfer, is extended for melting of granular packed beds. In this method, the fluid is simulated by computational fluid dynamics (CFD) and the soft-sphere discrete element approach (DEM) is used for the particle system. A four-way coupling accounts for solid-liquid interaction via drag and buoyancy forces and the collisions between the particles and the walls. The contact forces between the particles and wall-particle contacts have been calculated by the hertz-mindlin model. The particles heat up, melt and shrink due to heat and mass exchange, and the temperature distributions inside the particles are described. In order to validate the method, melting of a single ice particle and of a packed bed of ice in flowing water have been carried out. Very good agreement between the simulation and experiment has been achieved. The effects of the temperature and velocity of flowing water on melting rate are also discussed.

中文翻译：

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将 CFD-DEM 与传热传质相结合，研究颗粒填充床的熔化

摘要 扩展离散元法(XDEM)平台是一种具有传热传质的耦合欧拉-拉格朗日框架，适用于颗粒填充床的熔化。在该方法中，流体通过计算流体动力学 (CFD) 进行模拟，并且对粒子系统使用软球离散元方法 (DEM)。四向耦合通过阻力和浮力以及颗粒与壁之间的碰撞来解释固液相互作用。粒子和壁粒子接触之间的接触力已由赫兹-明德林模型计算。由于热量和质量交换，颗粒加热、熔化和收缩，并描述了颗粒内部的温度分布。为了验证该方法，已经完成了单个冰粒和流动水中的填充冰床的融化。模拟和实验之间取得了很好的一致性。还讨论了流动水的温度和速度对熔化速率的影响。