Abstract
To effectively remove microscale inclusions in the tundish, the Multi-Hole-Double-Baffles (MHDB), a novel flow control device in the tundish for continuous casting, was developed. The hole array mode of the MHDB will directly affect the trajectories of the inclusions. The effect and removal mechanism of the inclusions with sizes of 1 µm to 50 μm in the tundish with MHDB were studied by numerical simulation. The hole array mode of MHDB could affect the inclusions’ trajectories and distribution, and the mechanism underlying the effect of the MHDB was investigated using the discrete phase model (DPM). A 1:2.5 physical model was built to verify the accuracy of numerical simulation. The results showed that micro-inclusions were primarily driven by the drag force exerted by the molten steel flow, micro-inclusion trajectories followed the molten steel streamlines almost exactly, but buoyancy still played a role in the removal of the micro-inclusions near the molten steel surface; the hole array mode affected the trajectories of the micro-inclusions and controlled and decelerated the flow of molten steel, increasing the residence time of the molten steel flow a the value that is 15 times larger than the theoretical value; and “upper-in-lower-out” type MHDB showed the most efficient removal of micro-inclusions, with the removal rate being increased by 13–49% compared to the removal rates for the other type MHDB. The results of numerical simulation were well verified by physical simulation.
Highlights
Owing to the increasingly stringent quality requirements, many studies have investigated the equipment, process, and theoretical principles of continuous casting, for the tundish, which is the final metallurgical element reactor [1–6]
The steady k-ε model is the most useful mathematical model for the detailed studies of the flow field of the tundish, and many flow control devices have been improved by using this approach [28–30]
In order to compare the flow field in the tundish with different control flow devices and provide the initial the internal flow field in the MHDB, the the original tundish and the initial conditions conditionsfor forthe thesimulation simulationofof the internal flow field in the MHDB, original tundish the initial with conditions fordevice the simulation of the internal flow field in the MHDB, the original tundish5.and the tundish were simulated, and the concrete results were shown in Figure andthe the tundish with device simulated, andconcrete the concrete were shown in[5].Figure 5
Summary
Owing to the increasingly stringent quality requirements, many studies have investigated the equipment, process, and theoretical principles of continuous casting, for the tundish, which is the final metallurgical element reactor [1–6]. To improve the removal of inclusions by the tundish, many flow control devices, such as the turbulence inhibitor, weir-dam, baffle with holes, and filter and gas-curtain device, have been developed to optimize the flow field, increase the residence time, and promote inclusions’ removal [7–18]. The steady k-ε model is the most useful mathematical model for the detailed studies of the flow field of the tundish, and many flow control devices have been improved by using this approach [28–30]. The main main flow control device of the original tundish is the upper and lower baffles (UAIB). The flow control device of of the the MHDB originaldevice tundish is the the upper and lower baffles (UAIB). Three and array modes the guide-holes baffles configuration are investigated:.
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