9th International Conference on Modeling and Simulation of Metallurgical Processes in Steelmaking - STEELSIM2021

In metallurgy, gas is often injected into melts for mixing, degassing or refining. The knowledge of the two-phase flow behaviour is of utmost relevance for optimisation and process control. However, the measurement of the flow structure, the gas distribution and the characteristics of the bubbles is very challenging, because of the opaqueness and the high temperature of industrial relevant...

The bubble breakup and coalescence behavior and mechanisms in gas-stirred ladle were studied by establishing physical model and mathematical model. The mechanisms of bubble breakup and coalescence in the gas-stirred ladle and their influence on bubble size distribution were revealed. The results show that the bubble breaking behavior has little effect on bubble size and distribution. The...

Steel industry, even with best operating practices, has reported a minimum of 2 to 3 ppm nitrogen absorption, during transfer of molten steel from a ladle to tundish; up to 20 ppm of nitrogen absorption is not uncommon and have also been reported in literature. These imply that ladle shroud- collector plate nozzle (LS-CN) in practice is never perfectly secured and air ingression during ladle...

Non-metallic inclusions generated by mold flux entrapment are detrimental to the final steel’s quality. In this paper, a water model experiment was carried out to study the mold flux entrapment during the filling process. The side outlet was created at the mold to ensure the quasi-steady state of the filling process, which can help to visualize the formation of the open eye. Additionally,...

The recent development of data-assisted recurrence CFD (rCFD) has boosted the computational performance of CFD simulations by orders of magnitude. In a recent publication (Pirker et al, SRIN, 2020), we presented real-time simulations of multiphase fluid flow and alloy homogenization in a RH vacuum treatment plant on a computational grid of more than three million cells.

This computational...

Flow in the tundish region during the continuous casting of steel can influence many important phenomena, especially removal of the non-metallic inclusions. If they are not removed from the steel melt during its processing, it can reduce the quality of the finished steel product. Therefore, in this study, the complex numerical modelling in the CFD programme ANSYS Fluent was used for detection...

In continuous casting of steel, argon injection into the SEN (submerged entry nozzle) via the stopper is common practice. Nonetheless, the resulting phase distribution in the SEN is still under discussion. The main available casting parameters at the steel plant to determine the flow situation in the SEN, are usually the stopper rod position, the argon feeding pressure, the mass flow rate of...

The dynamics of co-current liquid-gas flow controls the flow patterns and phase distribution inside the submerged entry nozzle (SEN) in the continuous casting. According to the flow parameters during the argon gas injection, the unsteady two-phase flow in the SEN experiences different regimes from bubbly flow to annular flow. This regime transition is usually associated with a hysteresis...