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首页> 外文期刊>ISIJ international >Numerical Simulation of the Effects of Electromagnetic Brake and Argon Gas Injection on the Three-dimensional Multiphase Flow and Heat Transfer in Slab Continuous Casting Mold
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Numerical Simulation of the Effects of Electromagnetic Brake and Argon Gas Injection on the Three-dimensional Multiphase Flow and Heat Transfer in Slab Continuous Casting Mold

机译：电磁制动和氩气注入对板坯连铸结晶器三维多相流动和传热影响的数值模拟

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摘要

A 3-D mathematical model has been developed to study the multiphase phenomena of magnetic field, flow field and temperature distribution of molten steel and inclusion behaviour, considering the coupled effects of electromagnetic brake (EMBR) and argon gas injection in the slab continuous casting mold with high casting speed. The effects of EMBR and argon gas injection on the flow and temperature of molten steel and inclusion removal rate have been investigated. Simulation results indicate that EMBR can slow down the flow velocity of molten steel effectively, especially near the meniscus; the areas of upper and lower re-circulation zones are reduced and temperature distribution of molten steel is more uniform and the temperature gradient is reduced; but it has no helpful for the removal of small inclusions. The argon gas injection can increase the molten steel flow up tendency in the upper re-circulation area duo to the buoyancy effect of ascending argon gas bubbles near the submerged entry nozzle (SEN) and be in favour of the floating up of inclusion particles, and temperature in the upper re-circulation zone increases. The increasing of argon gas flow rate results in a stronger vortex flow zone near the free surface, especially near the SEN and easily forms a secondary eddy flow with EMBR, which impacts the fluctuation of free surface and the slag entrapment. The double action of EMBR and argon gas injection can further increase the temperature in the upper re-circulation zone, especially near the meniscus, and the floating up rate of inclusions are also improved and the inclusions to be trapped into solidified shell is reduced.
机译：考虑钢坯连铸结晶器中电磁制动（EMBR）和氩气注入的耦合效应，建立了3-D数学模型以研究钢水的磁场，流场和温度分布以及夹杂物行为的多相现象。高铸造速度。研究了EMBR和氩气注入对钢水的流动和温度以及夹杂物去除率的影响。仿真结果表明，EMBR可以有效地降低钢水的流速，特别是在弯液面附近。上下回流区面积减小，钢水温度分布更加均匀，温度梯度减小。但是它对于去除小杂物没有帮助。氩气的注入可以增加钢液在上回流区的流动趋势，这归因于浸入式水口（SEN）附近的氩气气泡上升的浮力作用，有利于夹杂物颗粒的上浮，以及上部再循环区的温度升高。氩气流量的增加会导致自由表面附近（尤其是SEN附近）的涡流区更强，并容易与EMBR形成二次涡流，从而影响自由表面的波动和炉渣截留。 EMBR和氩气注入的双重作用可以进一步提高上部回流区（尤其是弯月面附近）的温度，并且夹杂物的漂浮率也得到提高，并且夹杂物被困在凝固的壳体中。

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