Magnetohydrodynamic Effects on Insulating Bubbles and Inclusions in the Continuous Casting of Steel
Magnetohydrodynamic Effects on Insulating Bubbles and Inclusions in the Continuous Casting of Steel
复制标题
磁流体动力学对连铸钢中绝缘气泡和夹杂物的影响
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
T. Peeters
中科院分区：
文献类型：
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作者：
J. Haverkort;T. Peeters
本文研究了与绝缘夹杂物或气泡在导电液体中运动方向垂直的磁场所引起的磁流体动力学效应。由于磁场的存在，阻力系数的增加被认为对它们的终端上升速度有显着的影响。在连续铸钢机内，这种较低的终端速度对不需要的夹杂物的去除率具有潜在的负面影响，从而降低钢的质量。对一个绝缘刚性球体在电流作用下运动的模拟表明，单位体积的电磁泳力为− 1.0。数值流体和分散的气相模拟的内部浸入式喷嘴的流动表明，由于这种力，不均匀的磁场可以导致不均匀的气体分布，根据理论分析。特别地，可以定制磁场以增加或减少侧壁附近的气体量。
The magnetohydrodynamic effects associated with a magnetic field perpendicular to the movement of insulating inclusions or bubbles in a conducting liquid are investigated in this article. An increase in drag coefficient as a result of the presence of a magnetic field is argued to have a significant effect on their terminal rise velocity. Inside a continuous steel caster, this lower terminal velocity has a potentially negative effect on the removal rate of unwanted inclusions, degrading the steel quality. Simulations of an insulating rigid sphere moving in the presence of an electrical current show an electromagnetophoretic force per unit volume of − ψJ × B, with a shape factor ψ ≈ 1.0. Numerical fluid and dispersed gas phase simulations of the flow inside a submerged entry nozzle show that, because of this force, inhomogeneous magnetic fields can cause nonuniform gas distributions in accordance with a theoretical analysis. In particular, the magnetic field can be tailored to increase or decrease the amount of gas near the side walls.