论文部分内容阅读
在对液氦杜瓦的研究中,已有不少学者对通过绝热空间向内胆的辐射热流以及通过颈管壁的传导热流作过很多深入地分析,本文仅打算对法兰盖向液氦的辐射热流作点分析。基于在常规杜瓦中,法兰盖都处于室温条件,因此该辐射热流要比等面积的液氮温度辐射高二百多倍,在大口径的实验杜瓦中,这个热流的作用就更加可观了。从法兰盖辐射出来的热流在抵达液氦面之前其中只有一部分仅和回流冷氦气相互作用,
In the study of liquid helium Dewar, many scholars have done a lot of in-depth analysis on the radiant heat flow to the liner through the adiabatic space and the conduction heat flow through the neck wall. In this paper, Radiation heat flow for point analysis. Based on the fact that in the conventional Dewar the flange cover is at room temperature, the radiation heat flow is more than two hundred times higher than the equal area liquid nitrogen temperature radiation and the effect of this heat flow is even more impressive in the large-diameter experimental Dewar It’s The heat flux radiated from the flange cover only partially interacts with the recirculating cold helium gas before it reaches the liquid helium surface,