Determination of effective thermal conductivity of steel bar bundles with use of krischer model

Abstract

The article presents an analysis of the possibilities of using the Krischer model to determine the effective thermal conductivity of steel bar bundles for which the solid-phase is low-carbon steel and the gas-phase is air. The results of experimental research were used for this purpose. The analysis was carried out for the temperature range of 0–800◦C. Two solutions of the Krischer model were considered, full and simplified. In the simplified solution, it was assumed that the value of the weighting parameter f depends only on the diameter of the bars. It was shown that the results of the simplified solution differ from the results of the full solution by about 5%. This result shows, that from the point of view of industrial practice, the simplified solution of the Krischer model can be used to determine the effective thermal conductivity of packed bundles of carbon steel rods.