CFD Simulation of Molten Steel Flow with Isothermal Condition in the Continuous Casting Tundish (original) (raw)
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Modelling of flow behaviour in continuous casting tundish
Scandinavian Journal of Metallurgy, 2003
One of the steel plants of Steel Authority of India Ltd (SAIL) is considering a proposal to increase the capacity of tundish from the present level of 17 tonne to a targeted level of 25 tonne. As a step towards designing a larger tundish, the flow profile of steel in various alternate tundish configurations considered have been characterized using a 3-D steady-state mathematical simulation under assumption of both isothermal and non-isothermal conditions. Apart from generation of flow profiles of steel inside the tundish, the Residence Time Distribution curves have been predicted for analysis of flow behaviour inside the tundish. Based on the above analysis, the optimum tundish configuration was chosen for further development.
Numerical investigation of the fluid flow in continuous casting tundish using analysis of RTD curves
Journal of Iron and Steel Research International, 2009
A detailed mathematical procedure of the optimization of the fluid flow in a tundish water model with and without flow control devices (weir and dam) was carried out using the commercial CFD code FLUENT 6. O. The (£) two-equation model was used to model turbulence. The residence time distribution (RTD) curves were used to analyze the behavior of the flow in tundish. The location of flow control devices in the tundish was studied. The results show that the flow modifiers play an important role in promoting the floatation of nonmetallic inclusions in steel. Comparing the three geometric configurations that are considered (bare tundish, weir, weir+ dam) , the tundish equipped with the arrangement (weir-l-dam) is a best and optimal geometric configuration of tundish,
E3S Web of Conferences, 2021
The objective of this study was to analyze the fluid flow of molten steel in a continuous casting tundish using numerical simulations for better inclusion floatation and its separation. The tundish geometry was designed using Autodesk FUSION 360 and the analysis were performed on ANSYS FLUENT. The investigations were done on steady-state as well as transient conditions. To scale back vortexing and turbulence within the tundish, turbo stoppers and flow modulators, e.g. dam and weirs were placed for an optimized and efficient flow inside the tundish and its behavior on the spacious flow structure was explored. The strategic placements of the flow modifiers produced higher turbulence in the recess region of the tundish resulting in better turbulent flow withinside the inlet region of the tundish. Thereby a more homogeneous fluid flow is formed with better conditions for particle separation. Analysing the flow behavior we have determined the inclusion floatation using particle tracking ...
Computer Simulation of Fluid Flow Dynamics in a Novel Design of a Continuous Casting Tundish
2016
The main role of the tundish is to provide and distribute the molten steel, at a constant rate to the casting mold; however, because of the most rigorous quality requirements in recent years, the tundish has acquired great importance in eliminating inclusions. Traditionally, the continuous casting tundish is related to a rectangular container. In this research work the fluid dynamic of an innovative design of a continuous casting tundish consisting of a cylindrical body with half spherical ends was studied by using mathematical modeling. The dynamic behavior of the fluid in the new design showed that the curvature of the physical model will decrease the impact of the steel jet in the inlet and the fluid will tend to rise evenly through the walls of the tundish, since the spherical caps are regions of low velocity, in which much of the dead volume of the system is contained, thus it causes the phenomenon of vortex disappears. This behavior was compared with that of the straight type ...
METAL 2022 Conference Proeedings
Numerical modelling is becoming an essential part of research in the field of steel metallurgy at present. In numerical modelling, the operating equipment is replaced by a mathematical model, which consists of a system of partial differential equations. Numerical modelling is used to display processes and results that cannot be monitored under operating conditions. From numerical modelling we can obtain the results of the flow field, we can monitor the change in temperature and monitor the wear of the refractory lining, etc. This paper deals with numerical modelling of steel flow in the tundish. The tundish is a very important part of continuous casting. It supplies liquid steel during the ladle change and distributes steel between casting strands. The tundishes are made of a welded steel shell and lined with a refractory material. During casting steel, the tundish is the last reactor where it is possible to influence the quality and purity of the cast steel. It is necessary to know the processes in the tundish. This presented paper compares the results obtained by flowing steel in the tundish at non-isothermal conditions. A five-strand asymmetric tundish for bloom casting was used for numerical simulations. The paper also provides an overview of the issues of numerical simulations and their applicability in practice. Fluent software, which is part of the ANSYS package, was used for numerical simulations.
Molten steel flow in a wide single-strand tundish with different flow control devices (FCDs) for slab continuous-casting was investigated by physical and mathematical simulations in this work. The effects of different FCDs on the flow characteristics and velocity and temperature fields in the tundish with larger width, shorter length and larger depth were studied. The results showed that locations and dimensions of weirs and dams and geometry of turbulence inhibitors (TIs) have a large effect on the flow characteristics and velocity and temperature profiles. Adoption of a square turbulence inhibitor without extending top lips can improve the molten steel flow better than that with top extending lips in the tundish. In comparison with the former tundish configuration, the flow characteristics are improved to a great extent in the optimum case. A big “spring uprush” forms on the free surface around the long shroud when molten steel flows into a turbulence inhibitor with extending top lips and rushes up reversely out of the TI, while four small “spring uprushes” appear on the surface when a square TI without extending top lips is adopted because the liquid steel flows mainly out of the 4 corners of the square TI. The flow of liquid steel in the former tundish configuration is not reasonable and the height of an area where temperature is less than 1819 K is about half of liquid surface height at the right side of the stopper, which means that big dead zone exited in the former tundish configuration. In the optimum case, the height of such area was only one seventh of the liquid surface height. The RTD curves obtained from the mathematical simulation are agreed with those from the physical modeling and the flow characteristics obtained from these two methods in this work are coincident with each other.
A numerical model based on computational fluid dynamics was used to simulate the effect of nonisothermal conditions on melt flows in a multi-strand billet caster tundish. To start with, water was used as the operating fluid in a one-third scale tundish to calculate the fluid flow and temperature fields under isothermal and non-isothermal conditions. The model was then extended to the fullscale tundish with molten steel as the operating liquid in order to simulate the conditions in a real plant. It was observed that using step inputs of 10° and 23° for water and steel cases, respectively, changed the fluid flow patterns significantly, more so at locations far from the inlet, due to stronger buoyancy-driven natural convective flows. The temperature distribution and inclusion trajectories within the tundish were also affected due to the presence of non-isothermal conditions.
Metallurgical and Materials Transactions B-process Metallurgy and Materials Processing Science, 2001
In order to optimize steel flow and maximize the contact time of the inclusions with the slag layer inside the tundish, a proper flow-control arrangement must be designed, considering the shape, the dimensions of the prototype, and the plant operating conditions of the tundish. Physical and mathematical modeling has been used in this study, in a complementary fashion, to evaluate the influence of turbulence-inhibiting devices on the velocity fields, tracer dispersion, small- and large-particle trajectories, flow-pattern characteristics, and grade changes in a large-volume tundish. From the water model and mathematical simulation results, a flow-control system with the best performance was identified; this system must contribute to improving the productivity and cleanliness of the continuous-cast steel.