摘要
低温下真空多层绝热是非常有效的绝热方式 ,广泛应用于众多领域的科研和工程实践中。低温下真空多层绝热的影响因素很多 ,具体包括反射屏之间隔层的材料特性、反射屏的层数、层密度、真空度、捆扎的松紧程度等。运用热阻网络分析了间隔物为纤维材料的低温真空多层绝热结构的热阻组成 ,对总热阻中固体导热热阻Rconduction(solid) 、辐射换热热阻Rradiation、残余气体导热热阻Rconduction(gas) 分别建立了理论模型 ,并进行了理论计算推导 ,得到了低温下真空多层绝热结构总热阻的计算公式。
In cryogenics engineering applications the vacuum multiplayer insulation(VMLI),using alternate layers of shield and spacer material,is the most effective insulation The effective thermal performance of VMLI is a function of various parameters,such as shield and spacer materials,number of layers and layer density,vacuum maintained and interstitial pressure This paper presents an analysis theoretical model involving fabric spacer material This model considers the heat transfer by various modes,such as solid conduction,conduction through contact surfaces,radiation through the exposed area between adjacent shields and radiation through the fibrous spacer,gas conduction and etc The validity in cryogenic engineering design is proved through the comparision between the theoretical results and those of relatively published literatures
出处
《低温工程》
CAS
CSCD
北大核心
2001年第5期37-41,共5页
Cryogenics
