The thermal and electrical conductivities of carbon and graphite to high temperatures

Abstract

The thermal conductivity K is derived in terms of the difference in temperature which, in the steady state, is set up between the axis and the surface of a rod or tube of the material when the latter is electrically heated in an evacuated enclosure. The electrical conductivity σ is derived in the course of the same experiment from measurements of the current flowing in, and the potential-difference across, a length of the rod located near the centre. Solutions of the heat-flow equations are obtained for the case in which K and the electrical resistivity ρ are not constant but vary with temperature in a linear manner.