溶融金属表面波動抑制に及ぼす横断方向の直流磁場の勾配の効果

概要

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Molten metal being electrically conducting fluid, direct magnetic field can suppress wave motions which induce instabilities and surface defects in the several processes such as twin roll, electromagnetic casting, or conventional continuous casting. Transverse magnetic field was imposed on mercury surface wave and damping behavior was measured by making use of laser beam. It was found that the suppression of wave motion did not depend on field intensity but the gradient of it. A dispersion relation of wave motion, ω^2{ε_1 coth (ε_1h_0)+ε_2 coth (ε_2h_0)}=2ξ^2g, was derived from the theoretical analysis taking into account of the gradient of magnetic field, and was verified by the experimental results. The effect of gradient of transverse magnetic field on suppression of wave motion is discussed on the basis of the dispersion relation derived here.
社団法人日本鉄鋼協会の論文
1989-03-01