Elastic instabilities of polymer solutions in cross-channel flow
Elastic instabilities of polymer solutions in cross-channel flow
复制标题
DOI：
10.1103/physrevlett.96.144502
复制
发表时间：
2006-04-14
影响因子：
8.6
通讯作者：
Gollub, JP
中科院分区：
文献类型：
--
作者：
Arratia, PE;Thomas, CC;Gollub, JP
当聚合物分子通过微通道交叉流的双曲线点附近时，它们被强烈拉伸。当应变速率在低雷诺数（< 10（-2））下变化时，示踪和粒子跟踪实验表明，分子拉伸产生两种流动不稳定性：一种是速度场变得强烈不对称，另一种是速度场在时间上非周期性波动。即使远离不稳定区域，流动也会受到强烈扰动，这种现象可以用来产生混合。
When polymer molecules pass near the hyperbolic point of a microchannel cross flow, they are strongly stretched. As the strain rate is varied at low Reynolds number (< 10(-2)), tracer and particle-tracking experiments show that molecular stretching produces two flow instabilities: one in which the velocity field becomes strongly asymmetric, and a second in which it fluctuates nonperiodically in time. The flow is strongly perturbed even far from the region of instability, and this phenomenon can be used to produce mixing.