使用旋转运动控制惯性聚焦
Controlling inertial focussing using rotational motion
摘要：
在惯性微流体中，升力使颗粒穿过流线迁移到微通道的截面中的特定位置。我们控制粒子的旋转运动，并证明这允许操纵升力分布，从而粒子的平衡位置。我们使用多粒子碰撞动力学的方法进行二维模拟研究。具有不受约束的旋转运动的颗粒在通道的两个半部分中占据稳定的平衡位置，而中心是不稳定的。当外加力矩作用于粒子时，两个平衡位置通过鞍结分岔而湮灭，只剩下一个稳定的不动点，使得所有粒子都向通道的一侧移动。相反，当角速度固定为非零值时，非旋转颗粒聚集在中心并被推入通道的一半。
英文摘要：
In inertial microfluidics lift forces cause a particle to migrate across streamlines to specific positions in the cross section of a microchannel. We control the rotational motion of a particle and demonstrate that this allows to manipulate the lift-force profile and thereby the particle's equilibrium positions. We perform two-dimensional simulation studies using the method of multi-particle collision dynamics. Particles with unconstrained rotational motion occupy stable equilibrium positions in both halfs of the channel while the center is unstable. When an external torque is applied to the particle, two equilibrium positions annihilate by passing a saddle-node bifurcation and only one stable fixpoint remains so that all particles move to one side of the channel. In contrast, non-rotating particles accumulate in the center and are pushed into one half of the channel when the angular velocity is fixed to a non-zero value.
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