低孔密度泡沫金属的材质和厚度对池沸腾传热性能的影响  

Material effect on pool boiling heat transfer of open-celled metal foams with low pore density

作　　者：徐治国[1] 赵长颖[1] 

机构地区：[1]上海交通大学动力机械与工程教育部重点实验室,上海200240

出　　处：《热科学与技术》2013年第4期295-301,共7页Journal of Thermal Science and Technology

基　　金：国家重点基础研究发展计划(973)资助项目(2013CB228303);中国博士后科学基金(2013M540360)

摘　　要：试验研究了孔密度为5PPI,孔隙率为0.95的通孔金属泡沫的材质和厚度对池沸腾传热性能的影响。工质为去离子水。金属泡沫材质为铜和镍,泡沫厚度为5、6、7mm。最大热流密度为1.49×106 W·m-2。采用高速摄像仪观测泡沫表面气泡生长图像。试验结果表明,材质对低孔密度金属泡沫的池沸腾传热性能有重要的影响。铜泡沫和镍泡沫的池沸腾传热性能差别随着泡沫厚度的减小而减小。相比于光滑平板,金属泡沫延迟了沸腾危机点。随着泡沫厚度的减小,铜泡沫的沸腾传热能力先减小后增强,而镍泡沫的沸腾传热能力增强。The influences of material on pool boiling heat transfer performance of open-celled metal foam were investigated experimentally in saturated deionized water at atmospheric pressure. The foam materials were copper and nickel. The porosity remains the value of 0.95 and the pore density was 5 PPI. The foams thicknesses were 5, 6 and 7 mm. The highest heat flux in the present study was up to 1.49×10^6W·m^-2. Boiling patterns were captured by a high speed camera. The boiling curves of metal foams and a reference smooth surface were analyzed. The results show that material heavily influences pool boiling heat transfer of metal foam with the low pore density and the pool boiling heat transfer performance difference between copper foam and nickel foam decreases with decreasing of foam thickness. Compared with the smooth copper plate, all foam samples delay CHF. With decreasing of foam thickness, pool boiling heat transfer of copper foam first decreases and then increases, while nickel foam increases.

关 键 词：金属泡沫 池沸腾 材质 厚度 孔密度 

分 类 号：TK02[动力工程及工程热物理]