Heat Transfer During Melting of Packed Particulate Beds

了解与堆积颗粒床熔化有关的传输现象，对于我们预测严重核电站事故期间发生的过程，或通过原位玻璃化控制放射性废物，以及依赖于粉末作为原材料的各种材料加工技术的能力至关重要。该项目是首次深入研究堆积颗粒床熔化过程中的传热传质，包括实验和数值研究。目的是确定熔化填充床的输运性质，这对模拟熔化过程至关重要。这些特性包括有效导热系数、毛细管压力和相对渗透率。此外，熔化颗粒的形状对于模拟熔化过程中发生的致密化至关重要。这项研究的结果将使熔化过程能够精确地模拟。这将使该过程的设计能够在从危险废物的玻璃化到新材料的生产等广泛应用中实现预期的目标。

The understanding of the transport phenomena associated with the melting of packed particulate beds is critical to our ability to predict processes which occur during severe nuclear power plant accidents, or for the containment of radioactive wastes through in situ vitrification, and for a wide range of materials processing techniques which depend on powders as a raw material. This program, the first indepth study of heat and mass transfer during melting of packed particulate beds, involves both experimental and numerical research. The objective is to determine the transport properties for melting packed beds essential to modelling the melting process. These properties include effective thermal conductivity, capillary pressure, and relative permeability. In addition, the shape of melting particles is critical to modelling the densification which occurs during melting. The results of this research will enable the melting process to be accurately modelled. This will allow the process to be designed to achieve desired objectives in a wide range of applications ranging from vitrification of hazardous wastes to the production of new materials.