Abstract
The effect of a new cylindrical swirling flow tundish design on the multiphase flow and heat transfer in a mold was studied. The RSM (Reynolds stress model) and the VOF (volume of fluid) model were used to solve the steel and slag flow phenomena. The effect of the swirling flow tundish design on the temperature distribution and inclusion motion was also studied. The results show that the new tundish design significantly changed the flow behavior in the mold, compared to a conventional tundish casting. Specifically, the deep impingement jet from the SEN (Submerged Entry Nozzle) outlet disappeared in the mold, and steel with a high temperature moved towards the solidified shell due to the swirling flow effect. Steel flow velocity in the top of the mold was increased. A large velocity in the vicinity of the solidified shell was obtained. Furthermore, the risk of the slag entrainment in the mold was also estimated. With the swirling flow tundish casting, the temperature distribution became more uniform, and the dissipation of the steel superheat was accelerated. In addition, inclusion trajectories in the mold also changed, which tend to stay at the top of the mold for a time. A future study is still required to further optimize the steel flow in mold.
Highlights
The mold is the final stage during the continuous casting process of steel, where the solidification of the molten steel occurs
The multiphysics in the mold from a enhanced wall treatment for the first 75 s. This solution was used as an initial condition for conventional tundish casting and from a swirling flow tundish casting were analyzed and compared the RSM model calculation to 125 s for a developed flow field
This study was the first to try to investigate the influence of such swirling flow tundish design on the steel flow, heat transfer, inclusion motion, and steel/slag interface stability in the mold
Summary
The mold is the final stage during the continuous casting process of steel, where the solidification of the molten steel occurs. Multiphase flow, heat and mass transfer, slag entrainment, inclusion and bubble entrapment, inclusion removal, and solidification are very important multiphysics concerns in the continuous casting process. This is due to the fact that these issues can significantly influence the quality of the semifinal steel product. As a matter of the first importance, a desirable steel flow in mold is wanted, since the other physical phenomena are directly affected by the steel flow inside the mold. As an initial step to further improve the steel flow performance in a mold, numerical and physical modeling has become a common way to study the multiphase flow phenomena under various conditions. Some factors that may affect the mold flow, such as the SEN (Submerged Entry Nozzle) type (straight or bifurcated) [1,2], SEN port design (shape, angle, thickness) [3,4,5,6,7,8,9,10], argon bubbles [11,12,13,14,15,16,17,18,19,20,21,22,23], SEN immersion depth [3,4,6,24], nozzle clogging [25], mold flow modifier [26], EMBr (electromagnetic braking) [13,14,20,21,22,23,24,27,28,29,30] and M-EMS
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