NUMERICAL MODELLING OF THERMO - AND HYDRODYNAMIC PROCESSES IN A CONTINUOUSLY CASTED WORKPIECE AND OPTIMIZATION OF HEAT REMOVAL IN THE ZONE OF SECONDARY COOLING
. Cherepanov, . Popov
Khrustianovich Institute of Theoretical and Applied Mechanics RAS SB, Russia
INTRODUCTION
A great deal of papers [1-4] is devoted to thermophysical questions of the formation continuously casted workpiece (CCW). The main attention in the given papers is given to the laws of metals solidification, determination of efficient workpiece cooling modes, mechanisms of formation and development of various defects in casted products under stationary conditions of casting. Thus, the less studied are the non-stationary phenomena, caused by transient phenomena, and convective movement of liquid in the ingot core that considerably influencing the quality of cast metal. The peculiarities of ingot formation under the conditions of asymmetrical and non-uniform ingot external heat removal along the ingot perimeter that requires three-dimensional examination of the processes of heat transfer in a solidified workpiece are not enough studied.
The influence of refractory nanoparticles on the processes of crystallisation and quality of cast steel is not actually investigated. Therefore the investigation of thermal conditions of continuously casted ingot formation at diferent processing factors of casting and physical and chemical influence on solidified metal is an actual scientific and practical problem.
The given paper proposes the three-dimensional non-stationary model of steel ingot formation in a continuous workpiece casting machine. The numerical algorithm puter program have been created on the basis of this model. Convective movement in a liquid ingot core, conditioned by the influence of melt jets discharging out of two opposite openings in an immersion glass (forced convection) and non-uniformity of temperature field along the workpiece cross-section (thermo-gravitational convection) h
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