论文部分内容阅读
半透明介质相变传热在许多工程领域引起关注,其实质是变物性条件下伴随相变的辐射导热瞬态耦合传热问题,其难点在于相变过程中的辐射变物性问题,尤其是折射率的时空演变问题。本文首次研究相变过程中的变折射率问题。假设相变介质存在固相糊状液相区,固/糊界面、液/糊界面假定为半透明漫反射。采用多层辐射传递模型模拟相变介质内的辐射传递问题,考虑折射率分布在相变过程中随相变时间的变化及随相态空间的转换,研究其对相变辐射耦合传热的影响。结果表明,半透明介质相变过程的变折射率问题不可忽视。
Translucent dielectric phase transition heat transfer has drawn much attention in many engineering fields. The essence of translucent media is its transient heat transfer coupled with phase transition under variable physical conditions. The difficulty of translucent dielectric transient heat transfer lies in the problem of radiation variation during phase transition, especially the refraction Rate of space-time evolution problem. In this paper, we study for the first time the problem of variable refractive index during phase transition. Assuming that there is a solid phase of the liquid phase in the phase change medium, the solid / paste interface, the liquid / paste interface is assumed to be a translucent diffuse reflection. The multi-layer radiation transfer model is used to simulate the radiation transfer problem in phase-change media. The influence of the refractive index distribution on the phase-transition radiation coupling heat transfer . The results show that the problem of variable refractive index in the process of translucent medium phase transformation can not be neglected.