C-344 界面活性剤水溶液の流動誘起構造変化と流動不安定性

概要

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CTAB/NaSal aqueous solution forms worm-like micelles at a certain concentration and it causes flow-induced structure change when both shear rate and strain are higher than a certain values. In this state, the fluid becomes opaque and the flow 〓operty changes. In this report, the occurrence of the flow-induced structure in start-up behavior of Couette flow, steady planar elongation flow and dynamic planar squeezing flow was observed. The opaque region caused by the flow-induced structure was visualized by laser light sheet and the details of the flow motion were observed by particle motion. By the visualized images, it is clarified that the flow instability happens after the occurrence of the opaque region and a part of the opaque region returns to transparency during unstable state.
日本流体力学会の論文
2003-07-28