基于有限体积方法,建立三维传统阳极、纵向开槽和横向开槽阳极铝电解槽非稳态数学模型,采用磁动力流体模型(MHD)中电势法计算电磁场,把电磁力作为动量方程的源项,通过流体体积函数(VOF)法追踪电解质-铝液界面的波动,用离散相模型(DPM)追踪气泡的运动路径.对比分析传统阳极、纵向开槽和横向开槽阳极铝电解槽中电解质-铝液界面波动和气泡分布情况.结果表明,纵向开槽阳极下电解质-铝液界面波动幅度小于横向开槽阳极下的电解质-铝液界面波动幅度,且都小于传统阳极下电解质-铝液界面波动幅度.纵向开槽阳极底部的气体体积分数最小.
Based on the finite volume method, a three-dimensional physical and transient mathematical model for the traditional anode and the slotted anode in the aluminum electrolysis cell was developed to investigate the magnetohydrodynamic flow and gas bubble behavior.Magnetohydrodynamics model (MHD) solved by the electrical potential method was used to describe the electromagnetic field.The electromagnetic force (EMF) was taken as a source term in the momentum equation.The volume of fluid (VOF) approach was employed to track the bath-metal interface.The discrete particle model (DPM) was applied to study the motion of the gas bubbles in the aluminum electrolytic cells.The results indicated that the bath-metal interface fluctuation in the longitudinal slotted anode is less than that in the transverse slotted anode and also less than that in the traditional anode cell.The gas volume fraction in the bottom of longitudinal slotted anode is much small.
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