平面微通道内胶体旋转流动的产生
Flow Generation by Rotating Colloids in Planar Microchannels
摘要：
采用基于粒子的介观流体力学方法研究了微通道内磁性胶体在外部旋转磁场驱动下的非平衡结构形成及其由自旋向平动的转化.对于直通道，发现了倾斜。在环形通道中，通道曲率打破了对称性，并导致流体围绕环隙以与胶体旋转方向相同的旋转方向进行净输送。预测了平移速度对通道宽度、环半径、胶体浓度和热运动的依赖关系。
英文摘要：
Non-equilibrium structure formation and conversion of spinning to translational motion of magnetic colloids driven by an external rotating magnetic field in microchannels is studied by particle-based mesoscale hydrodynamics simulations. For straight channels, laning is found. In ring channels, the channel curvature breaks symmetry and leads to a net fluid transport around the annulus with the same rotational direction as the colloidal spinning direction. The dependence of the translational velocity on channel width, ring radius, colloid concentration, and thermal motion is predicted.
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