Fyzikální a numerické modelování mezních stavů proudění oceli v mezipánvi

Abstract

The submitted dissertation thesis deals with the use of physical and numerical modelling to study the process of the steel flow in the asymmetric five-strand tundish of continuous casting of steel. For the purposes of physical modelling, a plexiglas model on a scale of 1:4 was used for the operating tundish, and for numerical modelling, the geometry of the operating tundish was created on a scale of 1:1. The melt flow process in the tundish was modelled with a model liquid (water) in the physical modelling, while liquid steel was used as the standard flowing medium in the numerical modelling. Attention is focused on the assessment of relevant parameters influencing the character of the flow of the bath in the tundish - the shape of the impact pad, the internal height of the impact pad, the position of the ladle shroud to the impact pad and the distance of the ladle shroud orifice from the bottom of the impact pad. The limit states of these parameters were also verified. C curves were obtained from the physical experiments, from which the residence times and the representation of the volume fraction in the tundish were obtained. From the numerical simulations, the retention times were obtained from the calculated F curves. The results from both modelling methods achieved the same character, therefore the each other verification of the results of physical and numerical modelling can be considered sufficiently informative.