化学通道上的微纳米流体流动
Micro- and nanoscale fluid flow on chemical channels
摘要：
我们研究了衬底上化学图案上的液体薄膜的时间演化和驱动运动。格子玻尔兹曼和分子动力学方法分别用于模拟微观和纳米级薄膜的流动。最小化的流体表面积被用来检查相应的平衡自由能景观。重点是运动跨越模式包含发散和收敛的流动路口，着眼于对芯片实验室设备的应用。考虑了由体积力驱动的开放液-气系统和由边界运动驱动的封闭液-液系统。在早期的研究流动的线性化学通道，我们观察到连续运动的连接的液体膜在重复的副本的图案，尽管界面的珠光不稳定性的外观。只要驱动力的强度和液体的体积不太大，液体就被限制在化学品通道中，并且其运动可以通过图案的几何形状的微小变化来引导。
英文摘要：
We study the time evolution and driven motion of thin liquid films lying on top of chemical patterns on a substrate. Lattice-Boltzmann and molecular dynamics methods are used for simulations of the flow of microscopic and nanoscopic films, respectively. Minimization of fluid surface area is used to examine the corresponding equilibrium free energy landscapes. The focus is on motion across patterns containing diverging and converging flow junctions, with an eye towards applications to lab-on-a-chip devices. Both open liquid-vapor systems driven by body forces and confined liquid-liquid systems driven by boundary motion are considered. As in earlier studies of flow on a linear chemical channel, we observe continuous motion of a connected liquid film across repeated copies of the pattern, despite the appearance of pearling instabilities of the interface. Provided that the strength of the driving force and the volume of liquid are not too large, the liquid is confined to the chemical channels and its motion can be directed by small variations in the geometry of the pattern.
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