壁面轴向导热对微细管内对流换热的影响

工程热物理学报 , 2003, 24(5): 846-848.

1.清华大学工程力学系,传热强化与过程节能教育部重点实验室,北京,100084

2.清华大学工程力学系,传热强化与过程节能教育部重点实验室,北京,100084

3.清华大学工程力学系,传热强化与过程节能教育部重点实验室,北京,100084

4.清华大学工程力学系,传热强化与过程节能教育部重点实验室,北京,100084

基金项目: 国家自然科学基金(59995550-2)

EFFECTS OF AXIAL HEAT CONDUCTION IN THE WALL ON CONVECTIVE HEAT TRANSFER IN MICROTUBES

本文通过数值解析的方法研究了考虑壁面轴向导热时微细管内的对流换热.结果表明,当管外为对流换热边界条件时,管内充分发展对流换热的Nu依然在3.66～4.36之间.但若忽略壁面轴向导热,采用一维热阻模型整理微细管内对流换热的实验数据将会导致错误的结论.

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