摘要
为一套用于低温氢气回温的空浴式换热器建立了传热模型,着重考察结霜工况对传热性能的影响。针对等霜层厚度和线性变化霜层厚度等两种模型,计算和分析了不同风速对回温器的温度分布的影响以及满足复温需求的最小换热管长度。鉴于实际结霜工况应该介于两种理想霜层模型之间,为满足该低温氢气回温器换热要求,最低管外空气强制对流风速也应介于两种理想模型所要求的最低风速之间,即1.3—2.1 m/s之间。
A heat transfer model was constructed to analyze the performance of a hydrogen-air heat ex- changer, for rewarming the cryogenic hydrogen, under frosting condition. Based on two different frost layer thickness models （constant thickness model and linear varying thickness model） , the temperature distribu- tion in the rewarming heat exchanger were simulated and analyzed. The influence of air velocity on the tem- perature distribution and the minimum length of heat transfer pipe to meet the demand of rewarming were then discussed. Considering that the real frosting condition should be an intermediate model between the two ideal frost layer thickness models, the lowest air velocity outside the pipe in order to satisfy the heat transfer demand should also be between the required minimum air velocity for those two ideal models, i. e. , 1.3-- 2.1 m/s.
出处
《低温工程》
CAS
CSCD
北大核心
2015年第3期24-29,共6页
Cryogenics
基金
航天低温推进剂技术国家重点实验室基础研究课题(SKLTSCP1304)资助
关键词
氢气
回温器
传热性能
霜层厚度模型
hydrogen
rewarming heat exchanger
heat transfer performance
frost layer thicknessmodel
