Shear-induced structure change in shear-banding of a wormlike micellar solution in concentric cylinder flow
Shear-induced structure change in shear-banding of a wormlike micellar solution in concentric cylinder flow
复制标题
同心圆柱流中蠕虫状胶束溶液剪切带中剪切引起的结构变化
DOI：
10.1122/1.4961034
复制
发表时间：
2016
影响因子：
3.3
通讯作者：
Tsutomu Takahashi
中科院分区：
文献类型：
--
作者：
Masatoshi Ito;Y. Yoshitake;Tsutomu Takahashi
用双折射分布、速度分布和其他技术观察了虫状胶束溶液中剪切带的发生。然而，在双折射分布的观测方法中，单靠双折射分布不足以了解带状结构，也不足以检验剪切诱导结构（shear-induced structure， SIS）产生等胶束条件，还需要有取向分布。为此，本文提出了一种新的测量双折射率、取向角和应力光学系数沿径向分布的方法。利用应力光学系数作为识别胶束结构的关键因素，考察了各波段胶束的状态。采用新的图像分析技术，以色相值作为颜色信息，对交叉尼科尔法可视化图像进行精确量化。评估了取向角的径向分布。
The occurrence of shear-banding in wormlike micelle solutions has been observed by the birefringence distribution, velocity distribution, and other techniques. In the observation method of the birefringence distribution, however, the birefringence distribution is not enough to understand the banding structure and to examine the micelles' condition such as the generation of the shear-induced structure (SIS) but the orientation distribution is also required. In this study, a new technique to evaluate the distribution of the birefringence, the orientation angle, and the stress-optical coefficient along the radial direction was developed for this purpose. The stress optical coefficient is used as a key factor to recognize the micelles' structure, and the micelle condition in each band is examined. The visualized image by the crossed-Nicol method was precisely quantified by the new image analysis technique using the Hue value as color information. The radial distribution of the orientation angle was evaluated ...