Viscoelastic flow behavior and formation of dead zone around triangle-shaped pillar array in microchannel
Viscoelastic flow behavior and formation of dead zone around triangle-shaped pillar array in microchannel
复制标题
微通道内三角形柱阵列粘弹性流动行为及死区形成
DOI：
10.1007/s10404-022-02549-9
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发表时间：
2022
影响因子：
2.8
通讯作者：
Motosuke Masahiro
中科院分区：
文献类型：
--
作者：
Ichikawa Yoshiyasu;Motosuke Masahiro
本文报道了粘弹性流体在障碍物周围流动时形成的死区对流动特性的影响。已知，当半稀聚合物溶液粘弹性流体注入具有柱状结构的通道时，由于剪切变化引起的粘度变化，在结构周围形成DZ。在本研究中，水解聚丙烯酰胺溶液被注入一个微通道与三角形柱阵列。此外，利用微颗粒图像测速技术研究了矿柱周围的连续收缩和膨胀流动。流量测量结果表明，DZ的形状随Weissenberg数的变化而变化，因此DZ周围和内部的流动行为也会发生变化。特别是证实了整个流场的速度波动趋势随着DZ的增大而增大。此外，由于DZ与其他区域的速度差引起的剪切导致DZ内粘度分布不均匀，导致DZ内形成既包含扩展行为又包含旋转行为的复杂流动。
This study reports the influence of the dead zone (DZ) formed around obstacles due to the viscoelastic fluid flow on the flow behavior and properties. It is known that when a viscoelastic fluid, which is a semi-dilute polymer solution, is infused into a channel with structures resembling a pillar, a DZ is formed around the structure owing to the shear-variation-induced viscosity changes. In this study, hydrolyzed polyacrylamide solutions were infused into a microchannel with a triangle-shaped pillar array. Furthermore, the continuous contraction and expansion flow around the pillars were investigated using a micro-particle image velocimetry. The flow measurement results showed that the shape of DZ changes depending on the Weissenberg number, and accordingly, the flow behavior around and inside the DZ changes. In particular, it was confirmed that the velocity fluctuations trend in the entire flow field increased with the growth in DZ. Moreover, it was found that the shear caused by the velocity difference between the DZ and the other region induces a non-uniform viscosity distribution in the DZ, resulting in the formation of a complex flow containing both extension and rotation behavior inside the DZ.
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