Heat Transport of Powder as the Subject of Cryogenic Insulation : 2nd Report, Heat Conduction under Vacuum

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rights: 本文データは社団法人日本機械学会の許諾に基づきCiNiiから複製したものであるIn the present work, an investigation was made on the heat transport through insulation powder evacuated under high vacuum, in which an aluminium powder was added for radiation shield. Experiments on heat flux in the powder were carried out from room temperature down to liquefied Belgium temperature, which enabled us to examine the relation between the heat flux and temperature. Furthermore, the general solution for total heat transfer for combined radiation and conduction proposed by Wang and Tien was applied to the powder, and was compared with the experimental results. We then quantitatively determined the roles of the contribution from both radiation and conduction and the effect of added aluminium powder, and investigated the basic heat transfer mechanism in the powder at low temperatures such as extinction coefficient for radiation and contact conduction between particles.
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