Three-dimensional flow velocity and wall shear stress distribution measurement on a micropillar-arrayed surface using astigmatism PTV to understand the influence of microstructures on the flow field
Three-dimensional flow velocity and wall shear stress distribution measurement on a micropillar-arrayed surface using astigmatism PTV to understand the influence of microstructures on the flow field
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DOI：
10.1007/s10404-018-2095-8
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发表时间：
2018-06
影响因子：
2.8
通讯作者：
Y. Ichikawa;Ken Yamamoto;M. Motosuke
中科院分区：
文献类型：
--
作者：
Y. Ichikawa;Ken Yamamoto;M. Motosuke
本文采用三维速度测量方法，研究了微通道内微观结构对三维流场和壁面剪应力分布的影响。在微总量分析系统或芯片实验室应用中，流量控制是必要的。因此，微结构常用于流体系统的被动流动控制。然而，与微观结构相互作用的流场在三维上变得复杂。这种微流体流动的三维测量将有助于了解流动与结构的相互作用，并且对其他应用也很有用。本研究将微柱阵列引入到微通道中，采用散像粒子跟踪测速技术研究微柱对三维流场的影响，通过单次观测即可确定三维和三分量速度。此外，还研究了墙体的剪应力分布。实测结果证实了矿柱对围岩剪应力分布和三维速度分布的影响。与扁平通道（无柱阵列）相比，我们的通道中壁面剪切应力的空间变化范围约为- 80%至+ 20%。此外，我们还进行了数值模拟来巩固测量结果。
In this study, the influence of the microstructure in a microchannel on the three-dimensional (3D) flow field and shear stress distribution on the wall was investigated with 3D velocity measurement method. In a micro-total analysis system or a lab-on-a-chip application, the control of the flow is necessary. Thus, microstructures are often applied to the fluidic system for passive flow control. However, the flow field which interacts with microstructures becomes complicated three-dimensionally. The 3D measurement of such microfluidic flow would give insight on the interaction of the flow with the structures and be also useful for other applications. In this study, micropillar array was introduced in a microchannel and we investigated the influence of the micropillar on the 3D flow field by the astigmatism particle tracking velocimetry which enables to determine three-dimensional and three-component velocity by single-viewing. Furthermore, the wall shear stress distribution was also investigated. From measurement results, it was confirmed that the pillar changes the wall shear stress distribution and 3D velocity distribution. Compared to a flat channel (no-pillar array), the wall shear stress in our channel varied spatially in a range of approximately − 80 to + 20%. Moreover, we also conducted a numerical simulation to consolidate the measurement results.