Modeling Research Technique of Nonmetallic Inclusions Distribution in Liquid Steel during Its Flow through the Tundish Water Model

2019 ◽  
Vol 90 (10) ◽  
pp. 1900193 ◽  
Author(s):  
Tomasz Merder ◽  
Marek Warzecha ◽  
Piotr Warzecha ◽  
Jacek Pieprzyca ◽  
Artur Hutny
Keyword(s):  
Liquid Steel ◽  
Nonmetallic Inclusions ◽  
Water Model ◽  
Research Technique ◽  
Flow Through

scholarly journals Evolution of the Numerical Model Describing the Distribution of Non-Metallic Inclusions in the Tundish

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2229
Author(s):  
Tomasz Merder ◽  
Jacek Pieprzyca ◽  
Marek Warzecha ◽  
Piotr Warzecha ◽  
Artur Hutny
Keyword(s):  
Numerical Model ◽  
Liquid Steel ◽  
Nonmetallic Inclusions ◽  
Steel Production ◽  
Cfd Modeling ◽  
Water Model ◽  
Working Space ◽  
Production Stages ◽  
Steel Flow ◽  
Flow Controllers

Continuous casting is one of the steel production stages, during which the improvement in the metallurgical purity of steel can be additionally affected by removing nonmetallic inclusions (NMIs). This can be achieved by means of various types of flow controllers, installed in the working space of the tundish. The change in the steel flow structure, caused by those flow controllers, should lead to an intensification of NMIs removal from the liquid metal to the slag. Therefore, it is crucial to understand the behavior of nonmetallic inclusions during the flow of liquid steel through the tundish, and particularly during their distribution. The presented paper reports the results of the modeling studies of NMI distribution in liquid steel, flowing through the tundish. CFD modeling methods—using different models and computation variants—were employed in the study. The obtained CFD results were compared with the results of laboratory tests (using a tundish water model). The results of the performed investigations allow us to compare both methods of modeling; the investigated phenomena were microparticle distribution and mass microparticle concentration in the model fluid. The validation of the CFD results verified the analyzed computation variants. The aim of the research was to determine which numerical model is the best for describing the studied phenomenon. This will be used as the first phase of a larger research program which will provide for a comprehensive study of the distribution of NMIs flowing through tundish steel.

Comparison of flow behaviour in pressurized gating systems using water models and numerical simulation

2016 ◽  
Vol 14 (3) ◽  
pp. 652-674
Author(s):  
V. Jaiganesh ◽  
K. Prakasan
Keyword(s):  
Flow Visualization ◽  
Flow Behaviour ◽  
Water Model ◽  
Gating System ◽  
Commercial Software ◽  
Content Type ◽  
Filling Pattern ◽  
Flow Through ◽  
Water Models ◽  
Critical Sections

Purpose The purpose of this work is to visualize the flow behaviour in critical sections of a pressurized gating system. Design/methodology/approach The investigation was carried out using water models of gating system that were designed, invoking the principles of similitude. Water was used as the filling medium, and the manner of flow through various sections of the gating system and the cavity was recorded with a high-speed camera capable of capturing images up to 10,000 frames per second. This was followed by an analysis of the results obtained from each phase. Finally, computer simulations of flow were carried out using commercial software. The manner of filling as observed during experiments and that during simulation were compared so as to draw some useful conclusions on the utility of flow visualization using water models and the capability of software to predict the filling pattern during casting process. It was understood that water models are powerful aids for understanding the intricacies of flow through critical sections of the gating systems. Findings It was observed that water models are a reliable indicator of the mould-filling process. Further, substantial differences in the filling pattern were observed between water model experiments and filling simulation using commercial software. Research limitations/implications The findings are limited to horizontal plate-type castings. Also, the influence of surface roughness in the flow through the runner is not considered. Originality/value This work facilitates understanding of the importance of flow visualization on the quality and reliability of castings.

Study on Amplitude of the Surface of Liquid Steel in Bottom-Blowing Ladle with Immersed Tube

2013 ◽  
Vol 734-737 ◽  
pp. 1511-1515
Author(s):  
De Hui Zhang ◽  
Ming Gang Shen ◽  
Qing Hua Qi ◽  
Jin Wei Kuang
Keyword(s):  
Flow Rate ◽  
Molten Steel ◽  
Liquid Steel ◽  
Similarity Theory ◽  
Steel Slag ◽  
Water Model ◽  
Argon Flow Rate ◽  
Steel Making ◽  
Argon Flow ◽  
Bottom Blowing

In the process of bottom argon blowing large argon flow rate can cause vigorous fluctuations on the surface of the molten steel and splash and reoxidize the molten steel, making the slag rolled into the steel slag, also causing the erosion of the ladle lining refractories. A 1:7 ratio ladle water model system of 150 ton ladle was established from the similarity theory in the lab. Study and analyze the effects of the inserting depth and diameter of immersed tube and bottom blowing flow rate on the fluctuation of the surface of liquid steel. Results show that the fluctuations on the surface of steel can be limited effectively by changing the diameter and inserted depth of immersed tube when selecting a larger flow rate of bottom blowing, which improve the mixing effect of liquid steel.

Water model experiment of removal of inclusions in liquid steel by bubble flotation

2008 ◽  
Vol 105 (6) ◽  
pp. 309-316
Author(s):  
H. Arai ◽  
R. Otake ◽  
K. Matsumoto ◽  
S. Taniguchi
Keyword(s):  
Liquid Steel ◽  
Model Experiment ◽  
Water Model

scholarly journals Process Diagnosis of Liquid Steel Flow in a Slab Mold Operated with a Slide Valve

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1035
Author(s):  
Jafeth Rodríguez-Ávila ◽  
Carlos Rodrigo Muñiz-Valdés ◽  
Rodolfo Morales-Dávila ◽  
Alfonso Nàjera-Bastida
Keyword(s):  
Liquid Steel ◽  
Casting Process ◽  
Slide Valve ◽  
Heat Fluxes ◽  
Water Model ◽  
Process Diagnosis ◽  
Simulation Tools ◽  
Valve Opening ◽  
External Flows ◽  
Steel Flow

Slab molds receive liquid steel from the tundish through bifurcated submerged entry nozzles (SEN) using a slide valve as throughput control. Due to the off-centering position of the three plates’ orifices that conform to the valve to control the steel passage, the flow inside the nozzle and mold is inherently biased toward the valve opening side. In the practical casting, a biased flow induces inhomogeneous heat fluxes through the mold copper plates. The nozzle design itself is also a challenge, and has direct consequences on the quality of the product. A diagnosis of the casting process regarding the internal and external flows, performed through experimental and mathematical simulation tools, made it possible to reach concrete results. The mathematical simulations predicted the flow dynamics, and the topography and levels variations of the meniscus characterized through a full-scale water model. The flows are biased, and the meniscus level fluctuations indicated that the current nozzle is not reliable to cast at the two extremes of the casting speeds of 0.9 m/min and 1.65 m/min, due to the danger of mold flux entrainment. A redesign of the nozzle is recommended, based on the experimental and mathematical results presented here.

Optimization of Liquid Steel Flow in an Industrial Tundish

2013 ◽  
Vol 634-638 ◽  
pp. 1752-1755
Author(s):  
Qiu Fang Tong ◽  
Zhong Hua Wu ◽  
Arun S. Mujumdar
Keyword(s):  
Liquid Steel ◽  
Nonmetallic Inclusions ◽  
Fluid Dynamic ◽  
Numerical Results ◽  
Dead Volume ◽  
Flow Phenomena ◽  
Steel Flow ◽  
The Impact ◽  
Novel Design ◽  
Slag Entrapment

A computational fluid dynamic (CFD) model was developed to study the fluid flow phenomena taking place in an industrial tundish. Numerical results showed spatial distributions of the velocity vectors, the residence time and fields of turbulence kinetic energy. Selected computer simulation results were validated with experimental data. The effect of the impact pad and interior dams on the hydrodynamics of liquid steel flow were studied numerically and optimized to reduce the fraction of dead volume zones and augment nonmetallic inclusions to float into the slag. A novel design of a turbo-stopper was proposed and its function to decelerate the ladle shroud jet and direct the flow back to reduce slag entrapment was discussed. Such numerical results improved our understanding of the hydrodynamics of liquid steel flow in the tundish and contribute to an optimized operation.

scholarly journals Experimental Methods of Validation for Numerical Simulation Results on Steel Flow through Tundish

2016 ◽  
Vol 61 (4) ◽  
pp. 2057-2060
Author(s):  
J. Pieprzyca ◽  
P. Warzecha ◽  
T. Merder ◽  
M. Warzecha
Keyword(s):  
Numerical Simulation ◽  
Liquid Steel ◽  
Flow Distribution ◽  
Physical Modelling ◽  
Simulation Techniques ◽  
Computational Fluid Dynamics Cfd ◽  
Flow Through ◽  
Steel Flow ◽  
Liquid Flows ◽  
The Impact

Abstract The article presents experimental results on the impact of tundish flow regulator influencing the liquid steel flow course. The research was conducted based on the hybrid modelling methods understood as a complementary use of Computational Fluid Dynamics (CFD) methods and physical modelling. Dynamic development of numerical simulation techniques and accessibility to highly advanced and specialized software causes the fact that these techniques are commonly used for solving problems related to liquid flows by using analytical methods. Whereas, physical modelling is an important cognitive tool in the field of empirical identification of these phenomena. This allows for peer review and specification of the researched problems. By exploiting these relationships, a comparison of the obtained results was performed in the form of residence time distribution (RTD) curves and visualization of particular types of liquid steel flow distribution zones in the investigated tundish.

Sign in / Sign up

Export Citation Format

Share Document