Balvin Manuel, Sohn Eunkyung, Iracki Tara, Drazer German, Frechette Joelle
Department of Chemical and Biomolecular Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Phys Rev Lett. 2009 Aug 14;103(7):078301. doi: 10.1103/PhysRevLett.103.078301. Epub 2009 Aug 11.
We performed macroscopic experiments on the motion of a sphere through an array of obstacles that highlight the deterministic nature of the lateral displacements that lead to particle separation in microfluidic systems. The motion of the spheres is irreversible and displays directional locking. The locking directions can be predicted with a single parameter that distinguishes between reversible and irreversible particle-obstacle collisions. These results stress the need to incorporate irreversible interactions to predict the movement of a non-Brownian sphere passing through a periodic array.
我们对球体在一系列障碍物中的运动进行了宏观实验，这些实验突出了导致微流体系统中颗粒分离的横向位移的确定性本质。球体的运动是不可逆的，并表现出方向锁定。锁定方向可以用一个区分可逆和不可逆颗粒 - 障碍物碰撞的单一参数来预测。这些结果强调了纳入不可逆相互作用以预测非布朗球体通过周期性阵列运动的必要性。
