Methods for Estimating the Radiation Heat Transfer in Metal Pipe

Takayuki TOMARU
2009 TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)  
Synopsis: The heat transfer equation derived from the Stefan-Boltzmann law is frequently used to calculate the heat load due to thermal radiation in a cryogenic apparatus. This equation expresses heat transfer from one surface to the other, and includes no information on structures between these surfaces. In the case of thermal radiation through a metal pipe, which exists between different temperature regions, its reflection and conduction in the pipe (funneling) have to be considered. This
more » ... onsidered. This effect is much larger than the simple estimation derived from the solid angle between these temperature regions. In this paper, the heat transfer equation derived from a ray-trace model and an experiment conducted to confirm it are described. Moreover, the reduction experiment of this heat load using metal baffles is also reported.
doi:10.2221/jcsj.44.77 fatcat:myqh7ngicrefneqwajd3mqt7g4