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.
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