Modelling convective and radiative heat transfer in a glass melting model crucible

D. Cepite¹ - A. Jakoviċs¹ - B. Halbedel²

¹ Faculty of Physics and Mathematics, University of Latvia, 8 Zellu, LV-1002, Riga, Latvia
² Faculty of Mechanical Engineering, Technical University Ilmenau, Gustav-Kirchhoff-Strasse 6, D-98693 Ilmenau, Germany

Abstract
Numerical modelling of thermally and electromagnetically driven semi-transparent glass melt flow in an experimental model crucible has been done using both constant and temperature dependent physical properties of the melt. Impact of heat conduction, thermal and EM convection as well as radiation heat transfer has been analysed. Influence of the absorption coefficient on the maximum temperature T_max and temperature range ∆T in the melt has been estimated. Minima in dependencies T_max and ∆T on the absorption coefficient have been perceived. In case of the temperature dependent physical properties, corresponding to a real glass composition, importance of the radiative heat transfer in reducing the risk of overheating the melt has been illustrated. Tables 2, Figs 6, Refs 5.