论文标题
SN-PB合金方向水平固化期间EM强制流的数值模拟
Numerical simulation of the EM forced flow during Sn-Pb alloy directional horizontal solidification
论文作者
论文摘要
本文介绍了电磁(EM)强制对流对隔离形成的影响的研究。作为参考案例,从Hebditch和Hunt实验中凝固Sn-5 WT PCT PB合金。对流流的应用强迫由无量纲的电磁强迫参数$ f $确定。该研究的范围为$ -3.5 \ times 10^6 <f <3.5 \ times 10^6 $。对于不同应用的EM强制条件,获得了液相中液相的速度曲线和流动模式。由于参数分析,获得了雷诺数对电磁强迫参数的依赖性。电磁力可以显着影响液体散装中的流动,从而增加和减慢速度,并改变循环流动方向。溶质浓度分布分析表明,对流不影响全局溶质隔离形成。对于两种情况,获得了分离通道。但是,对全局隔离指数的分析表明,雷诺数的增加会引起此参数的略有下降。隔离形成的主要机制是将富含溶质的液体运输到糊状区域。在考虑的数值实验构型中,渗透到糊状区域不大,即使在液体散装中对流方向的变化也不会显着影响糊状区的流动。计算是通过OpenFOAM和Elmer中的开源代码进行的。
This article presents a study of the influence of electromagnetically (EM) forced convection on segregation formation. As a reference case the solidification of Sn-5 wt pct Pb alloy from the Hebditch and Hunt experiment is taken. Applied forcing of convective flow is determined by the dimensionless electromagnetic forcing parameter $F$. The study was carried out in the range $-3.5\times 10^6<F<3.5\times 10^6$. Velocity profiles and flow patterns in the liquid phase are obtained for different applied EM forcing conditions. As a result of parametric analysis, the dependence of the Reynolds number on the electromagnetic forcing parameter was obtained. Electromagnetic forces can significantly affect the flow in the liquid bulk, increasing and slowing down the velocity, as well as changing the circulating flow direction. Solute concentration distribution analysis has shown that EM-forced convection does not affect global solute segregation formation. For the two cases, segregation channels were obtained. However, the analysis of the global segregation index showed that an increase in the Reynolds number provokes a slight decrease in this parameter. The main mechanism of segregation formation is transport of solute rich liquid into the mushy zone. In considered numerical experiment configuration, the penetration into the mushy zone is not large, and even a change in the direction of convection in the liquid bulk does not significantly affect the mushy zone flow. The calculations were made by means of open source code in OpenFOAM and Elmer.