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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and numerical investigation on mass transfer induced by electromagnetic field in cold crucible used for directional solidification
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Experimental and numerical investigation on mass transfer induced by electromagnetic field in cold crucible used for directional solidification

机译：定向凝固用冷坩埚中电磁场引起传质的实验和数值研究

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摘要

Electromagnetic stirring induced by alternating magnetic fields could generate complex mass transfer in the liquid metals. In this paper, the flow field and the mass transfer behavior induced by the high frequency magnetic field in a square electromagnetic cold crucible (EMCC) used for directional solidification was experimentally and numerically investigated. By using tungsten particles as the tracer, the experiments under different operating powers and times were carried out, and the distribution of the particles in melt after cooling were analyzed. The results show that two mean eddies exist in the half meridian plane of the molten pool, and the skin effect results in a stronger convection within the skin layer. The mass moves following the mean eddies and emerges preferentially in the skin layer; when the mass is transported to the region between the upper and the lower eddies, which is homogenized in axial by the strong oscillations of convection. However, there is a concentration gradient along the radial in melt due to the skin effect. It found that the mass distributes more uniform with higher operating power or longer time. Moreover, the inhomogeneous convection at the vicinity of solid-liquid interface leads to the heterogeneous distribution of the mass, which aggravates the deflection of solid-liquid interface and changes the phase transition path during crystal growth.
机译：交变磁场引起的电磁搅拌会在液态金属中产生复杂的质量传递。本文对用于定向凝固的方形电磁冷坩埚（EMCC）中高频磁场引起的流场和传质行为进行了实验和数值研究。以钨粒子为示踪剂，在不同的工作功率和时间下进行了实验，分析了冷却后熔体中粒子的分布情况。结果表明，在熔池的半子午面中存在两个平均涡流，并且趋肤效应导致趋肤层内部的对流更强。肿块跟随平均涡流运动，并优先出现在皮肤层中。当质量被输送到上，下涡流之间的区域时，由于对流的强烈振荡，该区域在轴向上被均匀化。然而，由于趋肤效应，沿熔体的径向存在浓度梯度。结果发现，随着操作功率的增加或时间的延长，质量分布更加均匀。此外，固液界面附近的不均匀对流导致质量的不均匀分布，这加剧了固液界面的偏转并改变了晶体生长过程中的相变路径。

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