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Influence of non‐uniform material properties and water cooling on current density and temperature profiles in arc furnace electrodes
Author(s) -
Bullerschen Klaus,
Wilhelmi Herbert,
Wimmer Wolfgang
Publication year - 1985
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.198500689
Subject(s) - electric arc furnace , electrode , arc (geometry) , graphite , current density , current (fluid) , electric arc , electrical resistivity and conductivity , materials science , thermal conductivity , thermal , mechanics , water cooling , composite material , thermodynamics , metallurgy , chemistry , electrical engineering , mechanical engineering , physics , engineering , quantum mechanics
The influence of the simplifying assumption of constant electrical conductivity on the modelling of current density and temperature profiles in arc furnace electrodes is investigated in comparison with calculations taking into account the complete interdependence of electrical and thermal effects. With respect to the accuracy of the calculated values for UHP arc furnace electrodes it is shown that the classical theory for the skin effect using the approximation of constant electrical conductivity is inferior to an exact numerical evaluation, especially concerning the current distribution. A two‐dimensional thermal analysis is performed for combination electrodes consisting of a water cooling shank and a graphite wearing part, in order to demonstrate the cooling effect for the reduction of graphite consumption. In the electrodes considered here, the cooled region in the wearing part covers an axial distance in the order of one electrode diameter.