scholarly journals Mathematical Modelling of Multiphase Flow and Inclusion Behavior in a Single-Strand Tundish

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1213 ◽  
Author(s):  
Dong-Yuan Sheng
Keyword(s):  
Flow Control ◽  
Molten Steel ◽  
Gas Flow ◽  
Removal Rate ◽  
Single Strand ◽  
Model Verification ◽  
Momentum Exchange ◽  
Inclusion Removal ◽  
Flow Control Devices ◽  
Control Devices

A mathematical model was developed to study the effects of the flow control devices and the gas curtain on the steel cleanness in a single-strand tundish. The Eulerian–Lagrangian approach was applied to investigate the bubble flow and the behavior of the non-metallic inclusions in the system. Two modelling approaches were considered: (i) one-way coupling, where the influence of the micro-inclusion on the molten steel flow is neglected; and (ii) two-way coupling, where the momentum exchange between the molten steel and the bubbles is modelled. The model verification and validation (V&V) were carried out in order to establish confidence in the model predictions. Four different tundish configurations and the effect of various parameters, such as the inclusion size, the inclusion density and the gas flow rate, were investigated at the normal casting conditions. The results show that the flow control devices and the gas curtain reduce the extent of the dead volumes in the tundish and thus enhance the removal efficiency of the inclusions. Controlling the gas stirring intensity is important for tundish operation with the aim of removing the inclusions. Theoretical analysis suggests that small bubbles are preferable to increase the inclusion removal rate in industrial operations.

Numerical Simulation of Flow-Induced Corrosion in One-Strand Tundish

2010 ◽  
Vol 105-106 ◽  
pp. 142-145
Author(s):  
Mei Jie Zhang ◽  
Xiao Long Lin ◽  
Wu Yan ◽  
Huang Ao
Keyword(s):  
Flow Control ◽  
Molten Steel ◽  
High Speed ◽  
Flow Direction ◽  
Wear Properties ◽  
Refractory Wear ◽  
Wear Factor ◽  
Flow Control Devices ◽  
Control Devices ◽  
Turbulence Inhibitor

Flow control devices made of refractories are established in the tundish to modify the flow characteristics. In practical producing, the metallurgical function of flow control devices is weakened because of refractories corrosion. In this subject, an index named refractory wear factor which is used to evaluate the refractory wear was defined at first. And then, the characteristics of molten steel flow and the distribution of temperature and the refractory wear factor in a one-strand tundish equipped with flow control devices of a turbulence inhibitor, a weir and a dam were numerically simulated using the commercial CFD software. At last, the influence on refractory wear factor was analyzed. The following results were obtained. The high-speed molten steel is mainly confined to the injecting zone, especially to the turbulence inhibitor. The walls around the entering zone tundish and the weir wall faced to the flow direction have higher temperature than other walls. The highest value of refractory wear factor is focused on the inhibitor and bottom wall near the outlet. In order to keep the synchronization for the tundish, the refractories used in those zones should have higher anti-wear properties.

Modeling Study of the Influence of Flow Control Devices on Metallurgical Effects in a Large-Capacity and Deep Bath Tundish

2011 ◽  
Vol 71-78 ◽  
pp. 4411-4415
Author(s):  
Jiao Li ◽  
Guang Hua Wen ◽  
Ping Tang ◽  
Ming Mei Zhu
Keyword(s):  
Fluid Flow ◽  
Flow Control ◽  
Steel Ingot ◽  
Casting Process ◽  
Field Pattern ◽  
Inclusion Removal ◽  
Large Capacity ◽  
Flow Control Devices ◽  
Macro Scale ◽  
Control Devices

Besides the function of molten steel supply in casting process, tundish has a capability of decreasing the formation of macro-scale inclusions and promoting the flotation of the remaining inclusions. So, the metallurgy worker has been concentrating on to elevation product cleanness by improving flow field pattern of steel liquid and increasing inclusion floatation efficiency. In this study, a large-capacity and deep bath tundish for Heavy Steel Ingot with different arrangement was compared by mathematical simulation and water modeling. The results show that with flow control, the tundish has an important effect on the fluid flow pattern and inclusion removal.

scholarly journals Comparison of Fluid Flow and Temperature Distribution in a Single-Strand Tundish with Different Flow Control Devices

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 796
Author(s):  
Dong-Yuan Sheng ◽  
Dengfu Chen
Keyword(s):  
Fluid Flow ◽  
Flow Control ◽  
Single Strand ◽  
Water Model ◽  
Cfd Simulations ◽  
Flow Control Devices ◽  
Flow Heat ◽  
Control Devices ◽  
Steel Flow ◽  
Turbulence Inhibitor

The effects of flow control devices (FCD) in a single-strand tundish, including weir, dam, turbulence inhibitor and gas curtain, have been investigated using water model experiments and CFD simulations. A scaled-down water model was built up to visualize flow pattern and measure the residence-time distribution (RTD) of different tundish configurations. A CFD model was applied to calculate the fluid flow, heat transfer and RTD curves in the prototype tundish under the nonisothermal conditions. The Eulerian–Lagrangian approach was applied to investigate the bubble flow in the system. The results show that each FCD has its own unique function to control the flow. It is important to evaluate the combined effects of FCD based on their installations. The molten steel flow in the tundish could be improved if these flow control devices were arranged properly.

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