摘要
为了对实际发泡绝热液氮传输管道进行性能评价,通过建立蒸发率与平均导热系数之间的关系式,由蒸发率的测量来获得平均导热系数,建立了一套低温液体传输管道绝热性能检测装置,并对若干根2 m长发泡绝热液氮传输管道进行了测试,从而在不破坏发泡绝热层的条件下得出了实际管道绝热层真实平均导热系数。平均导热系数测量结果与发泡层取样导热系数测量结果对比表明:该测试装置所得数据准确可信,可作为发泡绝热低温流体输送管道无损绝热性能测试的标准测试台。详细描述了该测试装置的测量原理、方法和构成、以及数据采集和处理,最后讨论了影响平均导热系数测量的主要因素。
By establishing the function between evaporation rate and thermal conductivity, thermal conductivity was obtained without destroying foamed layer through testing the evaporation rate of 2 meters long actual pipes which transports liquid nitrogen. A set of testing equipment was established. The comparison between test and sampling test shows that this equipment was reliable and can be used as standard test bench to test the integral thermal conductivity of actual foamed insulated cryogenic pipes. The principle, structure of testing equipment, data acquisition, data analysis and the effect of test were all presented.
出处
《低温工程》
CAS
CSCD
北大核心
2008年第4期42-46,共5页
Cryogenics
关键词
发泡材料
平均导热系数
绝热
液氮
foamed materials
effective thermal conductivity
insulated
liquid nitrogen
