808 断熱材の新しい有効熱伝導率推定方法の提案(G06-2 熱物性・加工,G06 熱工学)

概要

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Concerning thermal insulation of alumina silica, an empirical equation, which relates the bulk density ρ, the absolute temperature T, and the thermal conductivity of the gas λ_a to the effective thermal conductivity λ, is proposed. The effective thermal conductivity has already been shown to be composed of conduction through the solid and the gas, and further thermal radiation thorough the insulation material. In our previous study, although we have proposed the empirical equation for alumina silica insulation, the accuracy of estimation was not good at the temperature below 600℃. In this study, a more accurate empirical equation is proposed by modifying the thermal conductivity of the gas. The newly proposed empirical equation is determined using thermal conductivities measured under vacuum conditions. The values predicted by using the proposed empirical equation are shown to agree well with the measured results.
一般社団法人日本機械学会の論文
2005-09-18