Flow-Induced Concentration Nonuniformity and Shear Banding in Entangled Polymer Solutions
Flow-Induced Concentration Nonuniformity and Shear Banding in Entangled Polymer Solutions
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DOI：
10.1103/physrevlett.126.207801
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发表时间：
2021-05-20
影响因子：
8.6
通讯作者：
Helgeson, Matthew E.
中科院分区：
文献类型：
--
作者：
Burroughs, Michael C.;Zhang, Yuanyi;Helgeson, Matthew E.
最近的模型预测缠结的聚合物溶液可以剪切带由于不稳定的流动诱导的分层。这项工作提供了第一个实验探针的缠结聚合物溶液在剪切下的原位浓度分布。在剪切速率高于临界值，我们表明，浓度和速度分布可以开发带，在定量协议与稳态模型的预测。这些研究结果突出了缠结聚合物溶液中的流量-浓度耦合的至关重要性。
Recent models have predicted entangled polymer solutions could shear band due to unstable flow-induced demixing. This work provides the first experimental probe of the in situ concentration profile of entangled polymer solutions under shear. At shear rates above a critical value, we show that the concentration and velocity profiles can develop bands, in quantitative agreement with steady-state model predictions. These findings highlight the critical importance of flow-concentration coupling in entangled polymer solutions.