Abstract
This work is devoted to the problem of heat and mass transfer processes in the
turbulent recirculated liquid metals
ows driven by the electromagnetic forces.
This kind of
ows often takes place in various practical applications like melting
of metals and alloys. Experimental investigations using physical model of
induction furnace have shown that the
ows are unstable and large amplitude
low-frequency oscillations were revealed by velocity measurements. However, the
existing turbulence modeling approaches were not able to calculate correct temperature
distribution for mentioned
ow types.
Extended numerical and experimental studies have been performed for three
dierent types of induction furnaces, where the velocity proles and temperature
elds were examined. The modelling results of the crucible induction furnace have
shown the necessity for the adequate simulation of the low-frequency oscillations
observed in the experiment, while the model of the induction crucible furnace
gave the possibility to study thoroughly the characteristics of these
ow instabilities.
The new modelinfg approach based on Large Eddy Simulation technique
has been applied in order to capture this phenomenon numerically, since traditional
two-equation turbulence models do not provide necessary opportunities.
The measurements and numerical calculations of the model induction crucible
furnace, which were focused on the specic parameters of the low-frequency oscillations,
gave the possibility to improve the proposed modeling method and also
to determine its application possibilieties.
The LES technique has been further applied for the modelling of the Aluminium
and Titan-Aluminium melting process in the induction furnace with the
cold crucible. The corresponding temperature and velocity measurements have
been done in Aluminium melt. The fully three-dimensional electromagnetic analysis
of the installation has been used as a base for the transient three-dimensional
coupled hydrodynamic and thermal calculations. The parameter study has been
performed in order to derive the tendencies for possible optimization of the melting
process in induction furnace with cold crucible.
