Heat Transfer During Melting of Packed Particulate Beds

对与填充颗粒床熔化相关的传输现象的了解对于我们预测发生在严重核电站事故期间的过程、通过原位玻璃化来遏制放射性废物以及依赖于以粉末为原料的广泛的材料加工技术至关重要。这是第一个深入研究填充颗粒床熔化过程中的热质传递的程序，包括实验和数值研究。目的是确定熔融填充床的传输特性，这是模拟熔化过程所必需的。这些特性包括有效导热系数、毛细压力和相对渗透率。此外，熔化颗粒的形状对于模拟熔化过程中发生的致密化非常关键。这项研究的结果将使熔化过程能够得到准确的模拟。这将使该工艺的设计能够在从危险废物的玻璃化到生产新材料的广泛应用中实现预期目标。

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.