Laboratory study of heat transfer through thin layers of casting slag: minimization of the slag/probe contact resistance

The heat flux densities through thin layers of casting slag have been measu red with a soft cooling heat flux probe which made smooth probe/slag interf aces. Thus the contact resistance was avoided. The evaluated effective ther mal conductivities were applied, together with the data on the contact resi stance, to compute the "system conductivities" existing in the continuous c asting "system" water cooled copper/slag/strand. The refractive index and a bsorption spectrum were measured and used to deduce functions for the radia tive and conductive (phonon) conductivities. Although precise values could not be obtained, due to the many assumptions involved, the data indicate th at the conductive conductivity does not change drastically at high temperat ures and on melting.