金属泡沫中填充石蜡的相变换热特性实验研究

发布时间：2019-03-09 13:02

【摘要】：本文对金属铜泡沫填充石蜡的相变换热特征进行了实验研究,通过测试试件加热面及内部的温度响应曲线,分析了金属泡沫填充及自然对流对石蜡非稳态相变换热过程的影响。研究结果表明,采用顶部加热方式时,石蜡内部的换热以纯导热为主,而采用底部加热时,液态石蜡内的自然对流作用使相界面移动速度更快,试件内部温度一致性更好,同时在相变对流区可实现对加热面的温度控制。金属泡沫的填充可强化石蜡内的导热但抑制液态石蜡的自然对流,前者使得试件加热面温升减缓,相界面移动加快,后者则导致底部加热时石蜡的相变区分为相变导热区和相变对流区。金属泡沫的导热强化能力在试件换热中占据主导作用。
[Abstract]:In this paper, the thermal characteristics of metal-copper foam filled paraffin wax are studied experimentally. The influence of metal foam filling and natural convection on the unsteady phase transformation heat process of paraffin wax is analyzed by measuring the temperature response curve of the heating surface and interior of the specimen. The results show that when the top heating is used, the heat transfer inside paraffin wax is mainly pure heat conduction, while when the bottom is heated, the natural convection in liquid paraffin makes the interface move faster and the temperature consistency in the specimen is better. At the same time, the temperature control of the heating surface can be realized in the phase transition convection region. The filling of metal foam can enhance the heat conduction in paraffin wax but inhibit the natural convection of liquid paraffin. The former makes the temperature rise of the heating surface of the specimen slow down, and the movement of the phase interface speeds up. The latter causes the phase transition region of paraffin wax to be divided into phase conduction zone and phase change convection region when the paraffin is heated at the bottom. The heat conduction strengthening ability of metal foam plays a dominant role in the heat transfer of the specimen.
【作者单位】：热流科学与工程教育部重点实验室西安交通大学能源与动力工程学院;
【基金】：国家自然科学基金(No.51676153) 111计划(No.B16038) 万人计划青年拔尖人才支持计划
【分类号】：TB34

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