電磁気力により浮揚された溶融金属自由表面の安定性の解析

概要

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A theoretical analysis has been made to clarify the stability condition of Horizontal Electromagnetic Casting (HEMC) by means of the linear stability theory. The stabilities of thin plates and round rods of molten metal are analyzed when infinitesimal perturbation waves are added on the free surface of molten metal levitated by electromagnetic force. The analysis reveals that influence of imposed magnetic field on the stabilization of perturbated surfaces is anisotropic and that the free surface of the metal is most stable when magnetic field is imposed parallel to the perturbation wave vector. The critical wave length which distinguishes stable condition from unstable one is 0.02 m for a molten steel plate with applied current density of 10^6 A/m^2. This length practically limits the distance between a metal supply nozzle and solidified part of the metal. The critical wave length for a round rod is almost the same as that for a plate if the diameter of the rod is the same as the thickness of the plate.
社団法人日本鉄鋼協会の論文
1990-06-01