Shear-induced structure change and flow-instability in start-up Couette flow of aqueous, wormlike micelle solution
Shear-induced structure change and flow-instability in start-up Couette flow of aqueous, wormlike micelle solution
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蠕虫状胶束水溶液启动时库埃特流中剪切引起的结构变化和流动不稳定性
DOI：
10.1122/1.2193742
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
M. Shirakashi
中科院分区：
文献类型：
--
作者：
M. Ouchi;Tsutomu Takahashi;M. Shirakashi
本文研究了组成为0.03mol/L十六烷基三甲基溴化铵（CTAB）和0.23mol/L水杨酸钠（NaSal）的蠕虫状胶束溶液中剪切诱导结构（SIS）的形成。采用透明玻璃制成的同心圆柱形库埃特池产生阶梯式启动剪切流。同时测量了剪切应力和作为流体透明度指标的亮度，并通过向流体中加入示踪粒子来观察流体运动。还测量了平行于涡轴通过的透射激光束的流动双折射和光强度，以监测流动引起的微观结构变化。宏观性质的瞬态行为，即，剪切应力和亮度彼此一致，并与光学显微结构测量一致，证实蠕虫状胶束溶液中透明到不透明变化的发生……
The occurrence of shear-induced structures (SIS) of a wormlike micellar solution is investigated using an aqueous solution of cethyltrimetylammonium bromide (CTAB)/aqueous sodium salicylate (NaSal) with composition CTAB (0.03mol∕L)∕NaSal (0.23mol∕L). A concentric cylinder Couette cell made of transparent glass is used to generate stepwise start-up shear flow. The shear stress and the brightness, which is an index of the transparency of the fliud, are measured simultaneously and the fluid motion is observed by adding tracer particles to the fluid. Measurements of flow birefringence and light intensity of a transmitted laser beam passing parallel to the vorticity axis are also carried out to monitor flow-induced microstructural changes. The transient behavior of the macroscopic properties, i.e., the shear stress and the brightness, are consistent with each other and with the optical microstructural measurements, confirming that the occurrence of the transparent-to-opaque change in the wormlike micelle solut...