Evidence for three-dimensional unstable flows in shear-banding wormlike micelles.
Evidence for three-dimensional unstable flows in shear-banding wormlike micelles.
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DOI：
10.1103/physreve.76.011503
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发表时间：
2007-07
期刊：
影响因子：
--
通讯作者：
L. Bécu;Domitille Anache;S. Manneville;A. Colin
中科院分区：
文献类型：
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作者：
L. Bécu;Domitille Anache;S. Manneville;A. Colin
本文报道了在20wt时，对浓缩虫状胶束体系CTAB中剪切带现象的实验研究。%在D2O中。时间分辨速度剖面记录使用超声波测速同时与全球流变数据。我们的结果证实了之前由Fischer和Callaghan[物理学家]进行的研究。[j].中国生物医学工程学报，2011(5)。时间平均速度剖面显示未剪切的“向列状凝胶”。在施加剪切速率范围内，流场表现出非常快的时间波动。对存在三维流动的怀疑进行了证明，并讨论了三维不稳定的可能原因以及壁面滑移与体动力的耦合。
We report on an experimental study of the shear-banding phenomenon in the concentrated wormlike micellar system CTAB at 20wt.% in D2O . Time-resolved velocity profiles are recorded using ultrasonic velocimetry simultaneously to global rheological data. Our results confirm the studies performed previously by Fischer and Callaghan [Phys. Rev. E 64, 011501 (2001)]. Time averaged velocity profiles display an unsheared "nematic gel." In the range of applied shear rate, the flow field exhibits very fast temporal fluctuations. Suspicions for the presence of three-dimensional flow are evidenced and possible causes for a three-dimensional instability are discussed together with the coupling of wall slip to bulk dynamic.