CONSIDERATION ON HEAT TRANSFER MECHANISM AND THERMAL CONDUCTIVITY OF THERMAL INSULATION BRICK (2nd)

摘要

The objects of this study are to research heat transfer mechanism in thermal insulation brick and to estimate temperature dependence of thermal conductivity of it. The insulation brick to be studied in this report is composed of aluminum oxide (AI2O3) and gases filledin pores. In the 1st report, a simple model which has narrow contact surface between two AI2O3 particles was considered. The results obtained by this model showed fairly good qualitative tendency.　However, there was considerable difference between numerical result and measured value informed by request person. From this standpoint, more approximate two dimensional and three dimensional models contained many particles of AI2O3 and pores are proposed by observation of section view photograph with SEM, and numerical analysis are investigated on these models. And moreover, experimental results by unsteady hot wire method are obtained over wide temperature range. The numerical results based on three dimensional models and experiments show good agreement at high temperature range.