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首页> 外文期刊>ISIJ international >Effects of Secondary Flow on the Electromagnetic Separation of Inclusions from Aluminum Melt in a Square Channel by a Solenoid
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Effects of Secondary Flow on the Electromagnetic Separation of Inclusions from Aluminum Melt in a Square Channel by a Solenoid

机译：二次流对螺线管电磁分离方道中铝熔体中夹杂物的影响

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摘要

Effects of secondary flow of the melt on the separation of inclusions from molten aluminum flowing in a square channel by a solenoid were investigated theoretically and experimentally. Numerical methods were used to calculate the secondary flow, the separation efficiency of inclusions, and the particle motion. It is found that there appear two recirculating loop flows in a quarter cross section of the channel and the separation efficiency of inclusions is significantly improved by the secondary flow mainly owing to the mixing effect. The separation efficiency increases with the increase of the effective magnetic flux density and the frequency of magnetic field, and decreases significantly with the increase of the size of the separator channel for a constant value of a/δ. However, it is possible to achieve high separation efficiency by using large-sized square channels and high frequency magnetic field with the help of the mixing effect of secondary flow. The computed results of particle trajectories show that the secondary flow accelerates the transportation of the particles from the inner region to the vicinity of the wall and greatly shortens the separation time of those particles. The effects of secondary flow on the separation efficiency were confirmed by comparing the measured separation efficiency with the computed results.
机译：从理论上和实验上研究了熔体二次流动对通过螺线管从方形通道中流动的熔融铝中夹杂物分离的影响。使用数值方法来计算二次流，夹杂物的分离效率和粒子运动。发现在通道的四分之一横截面中出现两个再循环回路流，并且主要由于混合作用，通过二次流显着提高了夹杂物的分离效率。分离效率随有效磁通密度和磁场频率的增加而增加，对于恒定的a /δ值，随着分离器通道尺寸的增加而明显降低。但是，借助于二次流的混合效果，通过使用大尺寸的方形通道和高频磁场可以实现高分离效率。粒子轨迹的计算结果表明，二次流加速了粒子从内部区域到壁附近的传输，并大大缩短了这些粒子的分离时间。通过将测得的分离效率与计算结果进行比较，可以确定二次流对分离效率的影响。

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