化工学报2011，Vol.62Issue(5)：1246-1251,6.DOI:10.3969/j.issn.0438-1157.2011.05.010
内壁填充环状金属泡沫的管内流动凝结换热
Flow condensation in tube filled with annular metal foam
摘要
Abstract
The tube with internally sintered annular metal foam layer is used to enhance the flow condensation heat transfer. The pressure drop and heat transfer of flow condensation for refrigerant R134a in the tube partially filled with annular metal foam are experimentally investigated to overcome the disadvantage of large pressure drop for tubes fully filled with metal foam. The tube wall temperatures are measured with thermal couples to determine the heat transfer coefficient. The effects of mass flux and vapor quality of two-phase fluid on the pressure drop and heat transfer coefficient are analyzed accordingly. It is found that the pressure drop of tubes partially filled with metal-foam is much higher than that of smooth tubes and the pressure drop increases non-linearly and greatly as the mass flux and vapor quality increase. The flow regime is predicted by monitoring the distribution and fluctuation of crosssection temperatures, from which the stratified wavy flow and annular flow are detected. It is also revealed that the flow condensation heat transfer coefficient for tubes partially filled with annular metal foam is about 2 times that of smooth tube and can be improved as mass flux or vapor quality increases.关键词
金属泡沫/流动凝结/压降/流型/换热Key words
metal foam/ flow condensation/ pressure drop/ flow pattern/ heat transfer分类
化学化工引用本文复制引用
徐会金,屈治国,杜艳平,何雅玲,陶文铨,卢天健..内壁填充环状金属泡沫的管内流动凝结换热[J].化工学报,2011,62(5):1246-1251,6.基金项目
国家自然科学基金项目(50806057) （50806057）
国家重点基础研究发展计划项目(2011CB610306) （2011CB610306）
全国百篇优秀博士论文作者专项基金项且(210141) （210141）
教育部新教师基金项目(200806981013),教育部新世纪人才计划项目(NCET-10-0640). （200806981013）
