论文标题
手性被动悬浮液中的奇数粘度
Odd Viscosity in Chiral Passive Suspensions
论文作者
论文摘要
先前的研究表明，非零奇数粘度是手性活性流体的重要特性。在这里，我们报告说，这种奇怪的粘度也存在于非活性或非外部驱动但心形的颗粒的悬浮液中。对于简单的剪切和平面伸展流动的密集棘轮的单层进行了计算模拟。两个棘轮之间的接触可以是无摩擦的或无限骨折的，具体取决于其牙齿和接触点的滑动方向。我们的结果表明，与光滑和齿轮样颗粒的悬浮液相比，棘轮悬浮液具有中间剪切/伸展粘度。同时，棘轮悬浮液显示出第一个正常应力系数的非零均匀成分和奇数成分，这表明传统的复合流体和手性粘性流体的混合特征。
Prior studies have revealed that nonzero odd viscosity is an essential property for chiral active fluids. Here we report that such an odd viscosity also exists in suspensions of non-active or non-externally-driven but chirally-shaped particles. Computational simulations are carried out for monolayers of dense ratchets in simple shear and planar extensional flows. The contact between two ratchets can be either frictionless or infinitely-frictional, depending on their teeth and sliding directions at the contact point. Our results show that the ratchet suspension has the intermediate shear/extensional viscosity as compared with the suspensions of smooth and gear-like particles. Meanwhile, the ratchet suspensions show nonzero even and odd components of the first normal stress coefficient, which indicates the mixed feature of conventional complex fluids and chiral viscous fluids.
