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首页> 外文期刊>日本機械学会論文集. B編 >CTAB/NaSal系界面活性剤水溶液の流動誘起構造および流動不安定性におよばす平面伸張ひずみ量の影響
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CTAB/NaSal系界面活性剤水溶液の流動誘起構造および流動不安定性におよばす平面伸張ひずみ量の影響

机译:平面拉伸应变对CTAB / NaSal表面活性剂水溶液流动诱导结构和流动不稳定性的影响

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摘要

ひも状や棒状のミセルを形成する界面活性剤水溶液 は単分散高分子溶液に似た顕著な粘弾性特性を持つこ とが知られている.ひも状ミセルの場合,高いせん断 速度を加えると白濁化やせん断粘ちょう化が生じるこ とがある.これらの光学的性質と流動特性の変化は流 動によってミセル構造が変化することが原因と考えら れており,この現象はせん断誘起構造化現象(SIS: Shear-induced structure)と呼ばれる.%An aqueous solution of CTAB/NaSal forms wormlike micelles and shows viscoelastic properties. It also shows flow-induced structure and flow instability in high shear rate flows. In this study, the occurrences of flow-induced structure and flow instability in planar elongational flows in a 4-roll mill flow cell were examined. An empirical formula of planar elongation strain as a function of elapsed time was proposed by results of particle trace velocimetry technique. In the planar elongational flow, the fluid was observed to become turbid, caused by the structure change, beyond a certain elongation rate. Subsequently, the elastic recoil was observed and simultaneously the turbid region disappeared. The change of turbidity is closely related to the planar elongation strain and the occurrence of the elastic recoil is related with a certain critical elastic energy. Furthermore, both critical rate and critical strain of the occurrence of these phenomena are considerably low in the planar elongation flow as compared with the shear flow.
机译:已知形成线状或棒状胶束的表面活性剂水溶液具有与单分散聚合物溶液相似的显着的粘弹性。在线状胶束的情况下,当施加高剪切速率时可能会出现混浊或剪切增稠。认为这些光学性质和流动特性的变化是由于流动引起的胶束结构的变化引起的,这种现象被称为剪切诱导结构化(SIS)。 %CTAB / NaSal水溶液形成蠕虫状胶束并表现出粘弹性,它在高剪切速率流中也表现出流致结构和流失性。在4辊轧机的流通池中进行了研究,根据颗粒痕量测速技术的结果,提出了平面伸长应变随时间变化的经验公式,在平面伸长流动中,观察到流体由于混浊而变浑浊。斜向观察到弹性反冲,同时混浊区消失。浊度的变化与平面伸长应变密切相关,弹性反冲的发生与一定的临界弹性有关。能量,这些现象发生的临界速率和临界应变在平面电场中都非常低与剪切流相比,注入流。

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