scholarly journals Prevention of Adhesion of Alumina Inclusions onto Submerged Entry Nozzle by Refractory Material Containing MgO and Al

2012 ◽  
Vol 98 (1) ◽  
pp. 10-18 ◽  
Author(s):  
Yutaka Awajiya ◽  
Mikio Suzuki ◽  
Keiji Watanabe ◽  
Koichi Tsutsumi ◽  
Yasuo Kishimoto ◽  
...  
Keyword(s):  
Refractory Material ◽  
Submerged Entry Nozzle

scholarly journals Influence of the Submerged Entry Nozzle’s Bottom Well on the Characteristics of Its Exit Jets

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 398
Author(s):  
Jesus Gonzalez-Trejo ◽  
Cesar A. Real-Ramirez ◽  
Jose Raul Miranda-Tello ◽  
Ruslan Gabbasov ◽  
Ignacio Carvajal-Mariscal ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Liquid Steel ◽  
Mold Wall ◽  
Casting Machine ◽  
Submerged Entry Nozzle ◽  
Central Plane ◽  
Impact Point ◽  
Single Vortex ◽  
Hydrodynamic Analysis ◽  
Principal Characteristics

In vertical continuous casting machines the liquid steel from the tundish is poured into the mold through the Submerged Entry Nozzle (SEN). The shape and direction of the SEN exit jets affect the liquid steel dynamics inside the mold. This work quantifies the effect of the SEN pool on the principal characteristics of the jets emerging from it, precisely, the shape, the spread angles, and the mold impact point. Experimental and numerical simulations were carried out using a SEN simplified model, a square-shaped bore nozzle with square-shaped outlet ports whose length is minimal. These experiments showed two well-defined behaviors. When a single vortex dominates the hydrodynamics inside the simplified SEN, the exit jets spread out and are misaligned about the mold’s central plane. On the contrary, when the inner flow pattern shows two vortexes, the exit jets are compact and parallel to the mold wide walls. The measured difference on the jet’s falling angles is 5°, approximately, which implies that in an actual casting machine, the impingement point at the narrow mold wall would have a variation of 0.150 m. This hydrodynamic analysis would help design new SENs for continuous casting machines that improve steel quality.

scholarly journals Effect of an external electric field on the wall of a rare earth steel submerged entry nozzle

2021 ◽  
Vol 11 ◽  
pp. 404-411
Author(s):  
Chen Tian ◽  
Lei Yuan ◽  
Jingkun Yu ◽  
Danbin Jia ◽  
Tianpeng Wen ◽  
...  
Keyword(s):  
Rare Earth ◽  
Electric Field ◽  
External Electric Field ◽  
Submerged Entry Nozzle

scholarly journals Generation of Reverse Meniscus Flow by Applying An Electromagnetic Brake

2021 ◽  
Author(s):  
Alexander Vakhrushev ◽  
Abdellah Kharicha ◽  
Ebrahim Karimi-Sibaki ◽  
Menghuai Wu ◽  
Andreas Ludwig ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Lorentz Force ◽  
Applied Magnetic Field ◽  
Numerical Study ◽  
Flow Direction ◽  
Experimental Studies ◽  
Submerged Entry Nozzle ◽  
Mean Flow ◽  
Slab Caster ◽  
The Mean

AbstractA numerical study is presented that deals with the flow in the mold of a continuous slab caster under the influence of a DC magnetic field (electromagnetic brakes (EMBrs)). The arrangement and geometry investigated here is based on a series of previous experimental studies carried out at the mini-LIMMCAST facility at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR). The magnetic field models a ruler-type EMBr and is installed in the region of the ports of the submerged entry nozzle (SEN). The current article considers magnet field strengths up to 441 mT, corresponding to a Hartmann number of about 600, and takes the electrical conductivity of the solidified shell into account. The numerical model of the turbulent flow under the applied magnetic field is implemented using the open-source CFD package OpenFOAM®. Our numerical results reveal that a growing magnitude of the applied magnetic field may cause a reversal of the flow direction at the meniscus surface, which is related the formation of a “multiroll” flow pattern in the mold. This phenomenon can be explained as a classical magnetohydrodynamics (MHD) effect: (1) the closure of the induced electric current results not primarily in a braking Lorentz force inside the jet but in an acceleration in regions of previously weak velocities, which initiates the formation of an opposite vortex (OV) close to the mean jet; (2) this vortex develops in size at the expense of the main vortex until it reaches the meniscus surface, where it becomes clearly visible. We also show that an acceleration of the meniscus flow must be expected when the applied magnetic field is smaller than a critical value. This acceleration is due to the transfer of kinetic energy from smaller turbulent structures into the mean flow. A further increase in the EMBr intensity leads to the expected damping of the mean flow and, consequently, to a reduction in the size of the upper roll. These investigations show that the Lorentz force cannot be reduced to a simple damping effect; depending on the field strength, its action is found to be topologically complex.

Refractory material based on alumina-magnesia spinel

1982 ◽  
Vol 39 (2) ◽  
pp. 89-92
Author(s):  
M. V. Glazacheva ◽  
A. M. Cherepanov ◽  
E. Ya. Medvedovskii ◽  
F. Ya. Kharitonov
Keyword(s):  
Refractory Material ◽  
Magnesia Spinel

Zirconia sol–gel coatings on alumina–silica refractory material for improved corrosion resistance

2009 ◽  
Vol 204 (4) ◽  
pp. 477-483 ◽  
Author(s):  
Aaron J. Kessman ◽  
Karpagavalli Ramji ◽  
Nicholas J. Morris ◽  
Darran R. Cairns
Keyword(s):  
Corrosion Resistance ◽  
Refractory Material ◽  
Sol Gel ◽  
Silica Refractory

EFFECTIVE THERMAL CONDUCTIVITY OF INSULATING-REFRACTORY MATERIAL

1977 ◽  
Vol 10 (3) ◽  
pp. 242-244 ◽  
Author(s):  
MASANORI FUJITSU ◽  
MASANOBU HASATANI ◽  
SACHIO SUGIYAMA
Keyword(s):  
Thermal Conductivity ◽  
Effective Thermal Conductivity ◽  
Refractory Material

Influence of the configuration of the submerged entry nozzle inner channel and electromagnetic effect within its length on the qualitative distribution of metal flows during continuous casting of steel

2021 ◽  
pp. 17-22
Author(s):  
A. Yu. Tretyak ◽  
◽  
Qiang Wang ◽  
Chun-Lei Wu ◽  
E. I. Shifrin ◽  
...  
Keyword(s):  
Quality Control ◽  
Continuous Casting ◽  
Submerged Entry Nozzle ◽  
Electromagnetic Stirring ◽  
Continuous Casting Of Steel ◽  
Electromagnetic Effect ◽  
Inner Surface ◽  
Continuously Cast ◽  
Inner Channel ◽  
Research Show

Today, the most promising and effective method of quality control of the continuously cast billets is electromagnetic stirring of the melt. In this case, an important component is the effect of the stirring on the jet in the nozzle. Moreover, as research has shown, this method is highly dependent on the configuration of the inner channel of the nozzle. Research have shown that positive or negative taper of the inner surface of the nozzle allows to obtain different results after applying EMS. Taper control completely changes the pattern of the melt flow and its deceleration in the mold, especially when it is casting of large billets. The results of the research show that minor changes in the taper of the nozzle significantly increase the effect of EMS implementation, which is observed already at 0.27 % of positive the taper and increases to 0.54%.

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