半柔性聚合物在微毛细管流中的迁移
Migration of semiflexible polymers in microcapillary flow
摘要：
采用细观流体动力学模拟方法研究了圆柱形微通道内半柔性聚合物在Poillille流作用下的非平衡结构和动力学性质。对于长度的一半，其持久性长度的聚合物，大的变化，在取向和构象被发现作为径向距离和流动强度的函数。特别地，聚合物在通道中心附近表现出U形构象。水动力相互作用导致强烈的跨流线迁移。表观迁移受聚合物取向及其扩散率的相应各向异性控制。观察到强烈的翻滚运动，与翻滚时间表现出相同的依赖性Peclet数作为一个聚合物在剪切流。
英文摘要：
The non-equilibrium structural and dynamical properties of a semiflexible polymer confined in a cylindrical microchannel and exposed to a Poiseuille flow is studied by mesoscale hydrodynamic simulations. For a polymer with a length half of its persistence length, large variations in orientation and conformations are found as a function of radial distance and flow strength. In particular, the polymer exhibits U-shaped conformations near the channel center. Hydrodynamic interactions lead to strong cross-streamline migration. Outward migration is governed by the polymer orientation and the corresponding anisotropy in its diffusivity. Strong tumbling motion is observed, with a tumbling time which exhibits the same dependence on Peclet number as a polymer in shear flow.
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