Particle Behavior in Curved Microchannels: Aspect Ratio Effects
Particle Behavior in Curved Microchannels: Aspect Ratio Effects
复制标题
弯曲微通道中的颗粒行为：纵横比效应
DOI：
10.1088/1742-6596/1909/1/012062
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Yanase S
中科院分区：
文献类型：
--
作者：
Hayamizu Y;Nakamura A;Hyakutake T;Gonda T;Morita S;Ohtsuka S;Yanase S
微流体系统的分选装置通过被动和主动机制两者操作。这些系统的微通道通常是弯曲的，以科普二次流，这允许分选或混合。因此，对微流控系统中的二次流进行表征是十分必要的。在这项研究中，我们研究了颗粒在螺旋矩形微通道的行为，并澄清的纵横比和迪恩数De颗粒分选的影响，通过比较实验和数值计算结果。我们制作了阿基米德螺旋微通道模型与毫米级尺寸的矩形截面。粒子跟踪测速（PTV）方法观察到的微通道中的粒子分选。此外，通过三维数值模拟中的颗粒跟踪方法，对颗粒分选机理进行了分析。当颗粒密度超过水密度时，当20< De< 40时观察到良好的分选。粒子分选行为的数值模拟结果与实验结果吻合较好。
The sorting devices of microfluidic systems operate by both passive and active mechanisms. The microchannels of these systems are often curved to cope with secondary flows, which allow sorting or mixing. Therefore, it is essential to characterize the secondary flows in microfluidic systems. In this study, we investigate the particle behavior in a spiral rectangular microchannel and clarify the effects of the aspect ratio and Dean number De on particle sorting by comparing experimental and numerical results. We fabricated Archimedean spiral microchannel models with the rectangular cross-section of millimeter-scale dimensions. Particle sorting in the microchannels was observed by the particle-tracking velocimetry (PTV) method. In addition, the particle-sorting mechanism was analyzed by the particle-tracking method in three-dimensional numerical simulations. When particle density exceeded water density, good sorting was observed when 20< De< 40. The numerical particle-sorting behaviors agreed well with the experimental results.