Abstract
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.
