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On the Agitation and Mixing of Molten Steel in a Ladle during DH Degassing Treatment Kiichi NARITA and Takehisa MAKINO Synopsis : The behavior of agitated flow and the mixing efficiency of molten steel in a ladle during DH degassing treatment was analogized by observing the motion of glycerin solution in a model equipment. The results were as follows. (1) The motion of the fluid after spouting out from a degassing vessel into a ladle is changed by the moving speed of ladle and the viscosity of fluid. (2) The volume of fluid, which is lifted up into degassing vessel from the ladle at one cycle of ladle lifting, does not depend on the viscosity of fluid but on the moving speed of a ladle. (3) The number of cycles required for mixing addition agent uniformly in the ladle is related to the moving speed of ladle and the viscosity of fluid, and _isalso closely related_to the volume of fluid lifted up into degassing vessel. (Received Mar. 30, 1970)