It is difficult to directly measure the surface temperature of the probe due to the complexity of heat transfer behavior on the probe surface in quench process.

Thermal behavior of vacuum concentric tube annulus is a process involving combined heat transfer mode, in which the thermal conduction of low pressure gas plays an important role.

In this paper, the effect of configuration size on the liquid nitrogen thermosyphon boiling heat transfer behavior in extreme eccentric annulus is studied for the first time.