界面活性剤ミセル水溶液中での連続沈降球の速度変化(<小特集>非ニュートン性,機能性を示す複雑流体の流動と応用)

概要

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In the present study, motions of a solid sphere falling through aqueous solutions of CTAB/NaSal are examined. At relatively low NaSal: CTAB mole ratios, almost the same increase ratio of the terminal settling velocity with the number of successive sphere drops is observed, independent of the diameter and the density of the sphere. The increase ratio of terminal settling velocity decreases exponentially with increasing interval time of sphere drops. At relatively high NaSal: CTAB mole ratios, the increase in the terminal settling velocity is not observed. The oscillatory change of settling velocity is observed above a critical shear rate of the sphere, accompanied by the vanishing of white turbid streak corresponding to the collapse of the shear-induced state (SIS) in the wake. The change in the settling velocity is explained by the viscous drag force and the additional drag force originated in the formation of the SIS.
社団法人日本機械学会の論文
2009-05-25