Microfluidic velocimetry with near-wall resolution
Microfluidic velocimetry with near-wall resolution
复制标题
具有近壁分辨率的微流控测速
DOI：
10.1016/s1290-0729(03)00057-7
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发表时间：
2003
影响因子：
4.5
通讯作者：
Dongqing Li
中科院分区：
文献类型：
--
作者：
D. Sinton;Dongqing Li
介绍了一种结合实验和数值分析的近壁分辨微通道内液体流速分布的方法。所采用的工作流体是具有笼状荧光染料的水溶液。通过将流体的横截面短暂地暴露于紫外光，光注入一片荧光染料。使用落射照明荧光显微镜系统将所得荧光染料的“带”的运输成像到CCD相机上。速度分布图是根据每次撑开事件后采集和处理的图像计算的。结果显示，在圆形截面毛细管中的压力驱动和电渗流的分析解决方案相比有利。近壁分辨率验证通过应用到电渗流与薄双电层。该技术的能力，以收集测速数据达2.5 μm的墙壁被证明。
A combined experimental and numerical analysis technique for velocity profiles with near-wall resolution in liquid microchannel flows is described. The working fluids employed are aqueous solutions with caged fluorescent dyes. A sheet of fluorescent dye is photo-injected by briefly exposing a cross-section of the fluid to ultraviolet light. The transport of the resulting ‘band’ of fluorescent dye is imaged onto a CCD camera using an epi-illumination fluorescent microscope system. The velocity profile is calculated from images acquired and processed after each uncaging event. Results are shown to compare favorably to analytical solutions in both pressure-driven and electroosmotic flow in circular cross-section capillaries. Near-wall resolution is verified through application to electroosmotic flows with thin electrical double layers. The ability of the technique to collect velocimetry data up to 2.5 μm from the wall is demonstrated.