曲率介导的液晶微流编程
Curvature-mediated Programming of Liquid Crystal Microflows
AI总结：
该研究结合实验与模拟，证实微通道曲率可调控向列相液晶微流，揭示曲率介导的流场-指向矢场反馈机制，为液晶微流控器件设计提供新原理，还明确了变形历史在粘弹效应相当情况下的作用。
摘要：
我们通过实验与数值模拟证明，微尺度管道的曲率可实现液晶（LC）流动的编程。针对在矩形截面U形和L形通道中流动的向列相液晶，研究结果显示，弯曲流道可引发流动诱导指向矢场在横向产生梯度。形成的指向矢场会对流场产生反馈，最终实现由通道曲率调控的液晶流动。这种经偏振光学显微镜观测、向列流体力学解验证的曲率介导流动控制，为基于液晶的微流控阀和节流器提供了新思路，其流量分布由Ericksen数和局部曲率变化决定。最后，本研究强调了当粘性效应与弹性效应强度相当时，变形历史对流动诱导指向矢排列的作用。
英文摘要：
Using experiments and numerical simulations, we demonstrate that the curvature of microscale conduits allow programming of liquid crystal (LC) flows. Focusing on a nematic LC flowing through U- and L-shaped channels of rectangular cross-section, our results reveal that curved flow paths can trigger gradients of flow-induced director field in the transverse direction. The emergent director field feeds back into the flow field, ultimately leading to LC flows controlled by the channel curvature. This curvature-mediated flow control, identified by polarizing optical microscopy and supported by the nematofluidic solutions, offers novel concepts in LC-based microfluidic valves and throttles, wherein the throughput distribution is determined by the Ericksen number and the variations in the local curvature. Finally, this work highlights the role of deformation history on flow-induced director alignments, when the viscous and elastic effects comparable in strength.
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