摘要
对六根金属泡沫强化管在R134a工质饱和温度分别为35℃和40℃时的凝结传热进行了实验研究,分析了金属泡沫孔密度、厚度等结构参数对凝结传热性能的影响。研究表明:孔密度为130 ppi的强化管凝结传热效果最好,强化倍率最大为光管的3.06倍;金属泡沫材料厚度的增加会导致凝结传热过程恶化。通过对相同孔密度、不同饱和温度和金属泡沫厚度管型管外传热系数与壁面过冷度曲线的分析发现:130 ppi和80 ppi系列管强化传热机理相似,毛细作用比较明显;40 ppi管主要以类似低肋管的结构为强化手段。
The condensation heat transfer performances of R134a of 6 metal-foam tubes were investigated experimentally with different saturation temperatures（35℃and 40℃）.The influence of metal-foam structure factors,the pore density and the thickness,were analyzed.The experimental results show that the tube with 130 ppi pore density has the best condensation heat transfer characteristics and its condensation heat transfer coefficient can reach to 3.06 times as that of the smooth tube.The thicker the metal-foam layer is,the worse the condensation heat transfer performance becomes.For 80 ppi and 130 ppi tubes,the capillary action is the dominant factor,while the low-finned-like effect is more important for 40 ppi tube.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2011年第5期839-842,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.50876083)
教育部新世纪优秀人才计划项目(No.NCET-09-0637)
关键词
金属泡沫
凝结传热
水平管外
metal-foam
condensation heat transfer
outside the horizontal tube
