THERMAL CONDUCTIVITY OF MAGNESIA, ALUMINA, AND ZIRCONIA POWDERS IN AIR AT ATMOSPHERIC PRESSURE FROM 200°F TO 1500°F

摘要

Attempts to understand how heat is transferred through powder-gas systems usually devolve to attempts to determine the systems thermal conductivities. There are an unlimited number of powder-gas "systems" possible, even for a single solid in a single gas, and appeal is generally made to some theory which predicts thermal conductivity in order to reduce the number of experimental measurements required. Reliable thermal conductivity measurements on sufficiently well characterized powder-gas systems over a wide range of conditions are needed for an understanding of the basic phenomena governing heat transfer in these systems. Also, such measurements permit meaningful evaluations of theories proposed to predict thermal conductivity of two phase systems from more easily measured properties and existing tabulated properties of the pure constituents.