超流氦杜瓦制冷器

简介超流氦的特性，超流氦杜瓦制冷在空间制冷中的应用现状。分析了超流氦杜瓦制冷器研究中的几个关键技术问题。     

Study of Dewar multishield insulation systems at 4.2–293 K

We have experimentally investigated the nature of heat leaks in Dewar vessels with multishield insulation systems which utilize the ‘cold’ of the stored cryogenic liquid's vapour. The temperature dependence of the thermal conductivity was determined for diagonal layer type insulation. This insulation uses aluminium foil and synthetic paper consisting of a mixture of polyethylene terephthalate and cellulose fibres. The temperature ranges investigated were 77–293 K and 4.2–293 K, using nitrogen or helium vapour, respectively, for cooling. The influence of the design parameters of vessels on helium evaporation has been studied analytically.