THERMAL CONDUCTIVITY OF SOLIDS AT HIGH TEMPERATURES AND HIGH PRESSURES

Abstract

In the present study, we have extended the model due to Tang1 based on the thermal conductivity equation due to Leibfried and Schlomann12 so as to make it applicable for a wide range of pressures and temperatures. We have used the Stacey14,15 equations of state (EOS) for determining the thermoelastic properties of NaCl , KCl and Al 2 O 3 at high pressures and high temperatures. These are used to estimate the variations of thermal conductivity with the change in pressure along different isotherms at selected temperatures. The results thus obtained are compared with the values derived from relations, which reproduced available experimental data well at low temperatures and low pressures. Experimental data at high temperatures and high pressures are not available. A close agreement between the two sets of data reveals the validity of the present work.