Abstract: Based on the magnetohydrodynamic module of the CFD FLUENT software, a three-dimensional mathematical model was developed to describe the multi-field coupling phenomenon in the electroslag remelting process. The model predicted values were in good agreement with the experimental measurements. The simulation results show that during the melt dripping process, the equivalent resistance of the slag decreases gradually, and the current is redistributed, which directly influences the energy consumption and production rate of the electroslag furnace. The maximum value of current density, electromagnetic force and velocity appears when the large melt droplet detaches. The maximum value of the current density is increased by almost one order of magnitude. And the maximum value of the electromagnetic force and velocity is increased by 2.5 and 4.7 times, respectively. The maximum value of Joule heat and temperature appears when the droplets fall into the slag-metal interface. The maximum value of the Joule heat and temperature is increased about 174.7% and 26.8%, compared with the moment of electrode started melting.

Key words: electroslag remelting, magnetohydrodynamics, multi-field coupling, melt droplet, dripping

摘要： 利用计算流体力学FLUENT软件中的磁流体动力学模块，建立了描述电渣重熔过程的多场耦合三维数学模型，对电渣重熔过程进行数值模拟，计算值与实验结果吻合较好，证明计算方法的可靠性. 模拟结果表明，随熔滴滴落过程进行，渣池的等效电阻逐渐减小，渣池内电流重新分配，直接影响电渣炉的电耗和生产率；电流密度、电磁力和速度的最大值都出现在大熔滴即将发生分离时，与电极开始熔化时相比，电流密度最大值增大近1个数量级，电磁力和速度场最大值分别增大2.5和4.7倍；而焦耳热和温度最大值出现在熔滴落入渣金界面时，分别增大174.7%和26.8%.

关键词: 电渣重熔, 磁流体动力学, 多场耦合, 熔滴, 滴落