Effect of Gas Injection Condition on Fluid Flow in a Two-Strand Tundish

2011 ◽  
Vol 291-294 ◽  
pp. 255-258
Author(s):  
Jiao Li ◽  
Jing Tao Zhu ◽  
Jing She Li ◽  
Li Yuan Sun
Keyword(s):  
Fluid Flow ◽  
Flow Pattern ◽  
Liquid Steel ◽  
Flow Condition ◽  
Dead Zone ◽  
Gas Injection ◽  
Water Modeling ◽  
Inclusion Removal ◽  
Injection Condition ◽  
Argon Injection

A water modeling approach was employed to investigate the effects of gas injection condition on the fluid flow in a two-strand tundish. The rational parameter of argon injection was determined as the optimized positions. Adopting the Case of weir-gas-dam could prolongs fluid’s retention, stagnation and peak periods in the tundish properly. The dead zone could be reduced to 17.4%. The flow pattern which was oberved with ink showed that the flow condition was improved greatly in Case 2(WGD), favoring the mixture of liquid steel and the inclusion removal.

Influence of Turbulence Controller on Flow Mode of Molten Steel in Tundish

2011 ◽  
Vol 189-193 ◽  
pp. 2411-2414
Author(s):  
Tian Fei Ma ◽  
Guo Qi Liu ◽  
Wen Gang Yang ◽  
Jian Bin Yu
Keyword(s):  
Fluid Flow ◽  
Residence Time ◽  
Molten Steel ◽  
Volume Fraction ◽  
Dead Zone ◽  
Plug Flow ◽  
Flow Mode ◽  
Water Modeling ◽  
Slab Caster ◽  
Numerical Computing

According to tundish for thin slab caster in a steel factory, 1:3 water modeling and numerical simulation were established. By measuring RTD(Residence time distribution) curves of fluid flow in tundish, real residence time, plug flow volume fraction and dead zone fraction were computed, influence of turbulence controller structure on flow mode of molten steel in tundish were studied. The results show that fluid flow in tundish can be improved, if turbulence controller has reasonable structure. A reasonable turbulence controller structure was obtained. Water modeling results agree with numerical computing results well.

Optimization of argon injection into shroud of tundish during continuous casting: a numerical study

2021 ◽  
Vol 118 (6) ◽  
pp. 613
Author(s):  
Fengjun Chang ◽  
Liangjun Li ◽  
Ran Xu ◽  
Yufen Wang ◽  
Xudong Cui
Keyword(s):  
Mathematical Model ◽  
Continuous Casting ◽  
Flow Pattern ◽  
Molten Steel ◽  
Numerical Study ◽  
Dead Zone ◽  
Argon Injection ◽  
Motion Characteristics ◽  
Steel Flow ◽  
Current Word

In order to prevent molten steel reoxidation in the tundish during continuous casting, argon injection into the shroud is applied. The injected argon bubbles in molten steel may change the molten steel flow pattern in the tundish. Consequently, the ratios of dead zone, plunger zone and well-mixed zone would change. Also, the motion of inclusions in the molten steel of tundish would change resulting from argon injection. The current word developed a coupling multiphase flow mathematical model. Basing on the developed model, the present work has researched the influences of argon injection on the molten steel flow pattern, inclusion motion characteristics in the tundish.

scholarly journals Fluid Flow Mechanical Stimulation-Assisted Cartridge Device for the Osteogenic Differentiation of Human Mesenchymal Stem Cells

Micromachines ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 927
Author(s):  
Ki-Taek Lim ◽  
Dinesh-K. Patel ◽  
Sayan-Deb Dutta ◽  
Keya Ganguly
Keyword(s):  
Tissue Engineering ◽  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Fluid Flow ◽  
Osteogenic Differentiation ◽  
Flow Condition ◽  
Cultured Cells ◽  
Human Mesenchymal Stem Cells ◽  
Proliferation And Differentiation ◽  
Static Conditions

Human mesenchymal stem cells (hMSCs) have the potential to differentiate into different types of mesodermal tissues. In vitro proliferation and differentiation of hMSCs are necessary for bone regeneration in tissue engineering. The present study aimed to design and develop a fluid flow mechanically-assisted cartridge device to enhance the osteogenic differentiation of hMSCs. We used the fluorescence-activated cell-sorting method to analyze the multipotent properties of hMSCs and found that the cultured cells retained their stemness potential. We also evaluated the cell viabilities of the cultured cells via water-soluble tetrazolium salt 1 (WST-1) assay under different rates of flow (0.035, 0.21, and 0.35 mL/min) and static conditions and found that the cell growth rate was approximately 12% higher in the 0.035 mL/min flow condition than the other conditions. Moreover, the cultured cells were healthy and adhered properly to the culture substrate. Enhanced mineralization and alkaline phosphatase activity were also observed under different perfusion conditions compared to the static conditions, indicating that the applied conditions play important roles in the proliferation and differentiation of hMSCs. Furthermore, we determined the expression levels of osteogenesis-related genes, including the runt-related protein 2 (Runx2), collagen type I (Col1), osteopontin (OPN), and osteocalcin (OCN), under various perfusion vis-à-vis static conditions and found that they were significantly affected by the applied conditions. Furthermore, the fluorescence intensities of OCN and OPN osteogenic gene markers were found to be enhanced in the 0.035 mL/min flow condition compared to the control, indicating that it was a suitable condition for osteogenic differentiation. Taken together, the findings of this study reveal that the developed cartridge device promotes the proliferation and differentiation of hMSCs and can potentially be used in the field of tissue engineering.

Effect on Position of Electromagnetic Stirring on Inclusion Behaviors in Billet

2013 ◽  
Vol 805-806 ◽  
pp. 1716-1719 ◽  
Author(s):  
Gui Fang Zhang ◽  
Yue Hua Ding ◽  
Zhe Shi
Keyword(s):  
Liquid Steel ◽  
Electrical Current ◽  
Medium Carbon Steel ◽  
Electromagnetic Stirring ◽  
Cast Billet ◽  
Inclusion Removal ◽  
Optimum Position ◽  
Steel Cleanliness ◽  
Plant Trials

A considerable number of research works have been carried out to study the effects of electric current and frequency of Electromagnetic Stirring (EMS) on the quality of cast steels, but there are only a few studies available addressing the effects of EMS location on inclusion removal and steel cleanliness An ideal position of EMS will improve inclusion floatation and separation from liquid steel. However, inappropriate installation will lead to the entrapment of the slag into liquid steel, and impact the quality of cast billet. The current applied for these plant trials was 300A at a frequency of 3Hz,positions form axial centers of EMS to the top of the mold were 450mm, 510mm and 690mm respectively . 130 billets of medium carbon steel were produced and samples were taken for spectral analysis to study the effects of installation location of EMS on steel cleanliness. The experimental results show that the optimum position of EMS should be placed 510mm from the top end of the copper mold when the electrical current is 300A at frequency of 3 Hz. The three parameters of placement of EMS in paper were obtained from the simulation results, and this paper focused mainly on the effect EMS position on inclusion behaviors in billet.

D-C Network-Analyzer Determination of Fluid-Flow Pattern in a Centrifugal Impeller

1947 ◽  
Vol 14 (2) ◽  
pp. A113-A118
Author(s):  
C. Concordia ◽  
G. K. Carter
Keyword(s):  
Fluid Flow ◽  
Flow Pattern ◽  
Arbitrary Shape ◽  
Centrifugal Impeller ◽  
Network Analyzer ◽  
Two Dimensional ◽  
Special Shape ◽  
Electrical Method ◽  
Incompressible Ideal Fluid

Abstract The objects of this paper are, first, to describe an electrical method of determining the flow pattern for the flow of an incompressible ideal fluid through a two-dimensional centrifugal impeller, and second, to present the results obtained for a particular impeller. The method can be and has been applied to impellers with blades of arbitrary shape, as distinguished from analytical methods which can be applied directly only to blades of special shape (1).

Slag Emulsification during Liquid Steel Desulphurisation by Gas Injection into the Ladle

2003 ◽  
Vol 74 (2) ◽  
pp. 77-85 ◽  
Author(s):  
Helmut Lachmund ◽  
Yongkun Xie ◽  
Thorsten Buhles ◽  
Wolfgang Pluschkell
Keyword(s):  
Liquid Steel ◽  
Gas Injection

scholarly journals Impact of Modified Spacer on Flow Pattern in Narrow Spacer-Filled Channels for Spiral-Wound Membrane Modules

Environments ◽  
2018 ◽  
Vol 5 (11) ◽  
pp. 116
Author(s):  
Zhiming Han ◽  
Mitsuharu Terashima ◽  
Bing Liu ◽  
Hidenari Yasui
Keyword(s):  
Shear Stress ◽  
Flow Pattern ◽  
Friction Factor ◽  
Flow Direction ◽  
Dead Zone ◽  
Three Dimensional ◽  
Stress Contour ◽  
Directional Change ◽  
Low Shear Stress ◽  
Membrane Modules

A modified spacer, which was constructed with arched filaments and zigzag filaments, was designed to improve vortex shedding and generate a directional change in flow patterns of membrane modules, especially in the vicinity of the feed spacer filament, which is most affected by fouling. A unit cell was investigated by using a three-dimensional computational fluid dynamics (CFD) model for hydrodynamic simulation. The results of CFD simulations were carried out for the fluid flow in order to understand the effect of the modified spacer on vortices to the performance of arched filaments at different distances. From 2D velocity vectors and shear stress contour mixing, the flow pattern and dead zone flushing were depicted. The ratio of low shear stress area to the total area increased with the inlet velocity closed to 20%. The energy consumption with respect to flow direction for the arched filament was 80% lower than that in the zigzag filament. Compared with previous commercial spacers’ simulation, the friction factor was lower when the main flow was normal to the arched filament and the modified friction factor was close to the commercial spacers. The homogenization was realized through the flow pattern created by the modified spacer.

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