Nonlocal effects in flows of wormlike micellar solutions.
Nonlocal effects in flows of wormlike micellar solutions.
复制标题
蠕虫状胶束溶液流动中的非局部效应。
DOI：
10.1103/physrevlett.100.038301
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发表时间：
2008
影响因子：
8.6
通讯作者：
A. Colin
中科院分区：
文献类型：
--
作者：
Chloé Masselon;J. Salmon;A. Colin
蠕虫状胶束的流动曲线通常表现出分离高粘度分支和低粘度分支的应力平台σ *，导致剪切带流动。本文研究了半稀释蠕虫状胶束体系在受限几何形状的直微通道中的流动。我们的本地流变学的特点，由于粒子图像测速。我们发现，流动曲线不能描述一个简单的本构方程连接的局部剪切应力的局部剪切速率。我们证明了蠕虫状胶束系统的流动中存在的非局部效应，并利用一个理论框架，允许测量相关长度。
The flow curve of wormlike micelles usually exhibits a stress plateau sigma* separating high and low viscosity branches, leading to shear-banded flows. We study the flow of semidilute wormlike micellar systems in a confined geometry: a straight microchannel. We characterize their local rheology thanks to particle image velocimetry. We show that flow curves cannot be described by a simple constitutive equation linking the local shear stress to the local shear rate. We demonstrate the existence of nonlocal effects in the flow of wormlike micellar systems and make use of a theoretical framework allowing the measurement of correlation lengths.