Numerical and Experimental Study of the Turbulent Flow and Particle Behavior Inside the Mould of a Twin Roll Caster
Sprache des Titels:
WCCM V - Fith World Congress on Computational Mechanics
A twin-roll casting process in which molten steel is introduced between a pair of chilled rotating casting rolls via a delivery nozzle has been analyzed with CFD tools and water model trials. Numerical and experimental studies were focused on flow pattern, temperature distribution and particle behavior within the liquid steel pool. The results for an advanced submerged entry nozzle will be presented.
Turbulent, three-dimensional, single-phase numerical calculations have been carried out with the CFD code Fluent. A quarter domain model of the whole nozzle/mold configuration was used to simulate the steel flow behavior inside the mold. Boundary conditions, which consider the rotation of the casting rolls and the solidification process along the rolls, have been specified.
A drift flux model was implemented to calculate the particle behavior inside the mold. The particles induced through the feeding nozzle into the mold have been modeled like a second phase, which moves with a constant drift velocity relatively to the fluid phase. Particle diameters in the range between 30 µm and 2 mm were numerically investigated.
To validate the numerical simulations experimental studies have been performed with a full-scale water model consisting of acrylic-glass. The mass flow rate along the casting roll surface corresponds to the square-root-t-law of solidification. Two-dimensional Digital Particle Image Velocimetry (DPIV) measurements of the flow velocity and turbulent kinetic energy were carried out to analyze the flow pattern inside both submerged entry nozzle and of the twin-roll strip caster. Apart from the time-averaged DPIV results the transient behavior of the flow in the pool has been measured with a time resolution of 7 images/second and will be presented as well.
Sprache der Kurzfassung:
Proceedings of the Fifth World Congress on Computational Mechanics (WCCM V)