1415 部分回転円板を用いた高分子水溶液の容器内旋回流れにおける渦放出(S30-3 複雑流体の流動現象(3),S30 複雑流体の流動現象)

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This paper deals with flow of aqueous polymer solutions due to a partial rotating disc in a cylindrical casing. The ratio of container radius R_c to disc radius R_d, σ=R_d/R_c, is 0.4, 0.6 and 1.0. As the aqueous polymer solution, 0.5, 0.8 and 1.0wt% polyacrylamide (PAA) solutions are used. The behavior of flow has been investigated using a flow visualization technique. It was observed that at σ=0.4 and 0.6, the ring vortex was formed near the partial rotating disc and it was shed periodically, as well as at σ=1.0. The diameter of the ring vortex B/(2R_c) increases with the increase of the Reynolds number Re_o, in which the relation between B/(2R_c) and Re_o is dependent on the concentration of PAA solutions, not on the ratio of container to disc radii σ. Regardless of the solution concentration or the cylinder-to-disc ratio σ, the height of the vortex is about one-fifth the size of diameter of the rotating disc.
2007-09-07