Tristability in Viscoelastic Flow Past Side-by-Side Microcylinders
Tristability in Viscoelastic Flow Past Side-by-Side Microcylinders
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DOI：
10.1103/physrevlett.126.054501
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发表时间：
2021-02-01
影响因子：
8.6
通讯作者：
Shen, Amy Q.
中科院分区：
文献类型：
--
作者：
Hopkins, Cameron C.;Haward, Simon J.;Shen, Amy Q.
微尺度多孔阵列中的粘弹性流动表现出复杂的路径选择和切换现象。然而，了解这一过程是有限的，缺乏一个单一的对象和大型阵列之间的联系的研究。在这里，我们报告的实验粘弹性流动通过并排的微柱可变缸间间隙。随着流量的增加，一个序列的两个不完美的破坏性的分叉迫使选择一个或两个的三个可能的流动路径周围的气缸。调整差距长度通过值，其中第一分叉变得完美，揭示了在无量纲流量间隙长度相图的双稳态和三稳态区域。
Viscoelastic flows through microscale porous arrays exhibit complex path selection and switching phenomena. However, understanding this process is limited by a lack of studies linking between a single object and large arrays. Here, we report experiments on viscoelastic flow past side-by-side microcylinders with variable intercylinder gap. With increasing flow rate, a sequence of two imperfect symmetry-breaking bifurcations forces selection of either one or two of the three possible flow paths around the cylinders. Tuning the gap length through the value where the first bifurcation becomes perfect reveals regions of bistability and tristability in a dimensionless flow rate-gap length phase diagram.