Analysis of Thermal Radiation in the Heating of Steel Round Bar Bundles

R. Wyczółkowski, J. Boryca Department of Industrial Furnaces and Environmental Protection, Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, al. Armii Krajowej 19, 42-200 Czestochowa, Poland

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The article analyses the share of thermal radiation Qrd in the process of heating up the bundles of steel round bars during the heat treatment. For this purpose the own calculation model based on the analogy of thermo-electricity was used. In proposed approach to each heat transfer mechanism the appropriate thermal resistance is assigned. Then, based on the geometric model of the considered medium in the form of so-called elementary cell, the effective thermal conductivity kef was calculated. Coefficient kef was calculated for two cases, first considering all heat transfer mechanisms and then omitting thermal radiation. Because coefficient calculated for the second case concerns only thermal conduction phenomenon, it was called substantial thermal conductivity and was marked as ksu. Share of thermal radiation in the total heat transfer Qrd was calculated by comparison the values of kef and ksu coefficients.

DOI:10.12693/APhysPolA.135.256 topics: heat treatment, steel bars, bar bundle, thermal radiation, effective thermal conductivity