螺旋磁场驱动金属液轴向流动的研究

Research on the Axial Flow of Liquid Metal Driven by a Helical Magnetic Field

通过螺旋结构的永磁体搭建了螺旋磁场,采用超声波多普勒测速的方法测量了螺旋磁场作用下GaInSn合金在圆柱和方形容器内轴向速度的分布情况。结果表明:圆柱容器内液态金属的轴向流动有大环流和二次流两种形态,其流动形式是旋转磁场和移动磁场共同作用的结果,二次流的发生大大降低了螺旋磁场轴向上的搅拌效果。

Vertical flow of liquid metal in cylindrical and hexahedral vessels driven by a helical magnetic field was investigated in the experiments. The helical magnetic field was constructed with several pieces of permanent magnets magnetizing in the radius direction. The vertical velocity distribution of liquid GaInSn alloy was measured with ultrasonic Doppler velocimeter （UDV）. The axial flow resulted from the competition of the large vertical vortex driven by traveling magnetic field and the secondary flow driven by the rotating magnetic field. The axial stirring effect greatly decreased when the secondary flow occurred.