0501 界面活性剤ミセル水溶液中での連続沈降球背後の流れの構造(OS5-1 非ニュートン流体の流動現象,オーガナイズドセッション)

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In the present study, flow structure behind a sphere falling through aqueous solutions of CTAB/NaSal are examined using a dye visualization and a PIV. Visualized dye patterns indicate that aqueous solutions of CTAB/NaSal forms multi layered structure behind a falling sphere. At relatively low salt concentrations, it is observed that the dye detaches from a sphere with its end moving upward where the velocity of fluid in the wake is in the opposite direction to the sphere sedimentation. On the other hand, at relatively high salt concentrations, these phenomena are not observed and the velocity distribution forms wedge like shear layers. At the sudden acceleration of the sphere during sedimentation, it is observed rapid stretching of dye and rapid increasing of upward velocity inducing strong flow behind a sphere.
2009-11-06