Quantitative visualization of micro-tube flow using micro-PIV
Quantitative visualization of micro-tube flow using micro-PIV
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DOI：
10.1007/bf03181480
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发表时间：
2004
影响因子：
1.7
通讯作者：
Y. Sugii;K. Okamoto
中科院分区：
文献类型：
--
作者：
Y. Sugii;K. Okamoto
本文对内径为100 μm的微圆管内的流场进行了PIV测量，以考察微尺度效应。由于微管的折射率与水的折射率基本一致，因此可以清楚地观察到管内的流动情况。利用显微镜、高灵敏度CCD相机、双脉冲Nd:YAG激光器和光学器件研制了微型PIV系统。将微PIV技术应用于流动中，在圆管中心平面近壁面处测量了空间分辨率为1.8 × 1.8 μm的速度分布。结果表明，管壁附近的速度小于用泊泽维尔定律计算的理论值。认为这种差异是由于微粒与壁面的干涉、壁面摩擦、表面张力等微观尺度效应造成的。
This paper describes PIV measurements ofthe flow field in a micro round tube with an internal diameter of 100 μm in order to examine micro-scale effects. Since the refractive index of the micro tube almost corresponds to that of water, the inner flow in the tube can be observed clearly. The micro PIV system has been developed using a microscope, a high sensitive CCD camera, a double pulsed Nd:YAG laser and optics. Applying the micro PIV technique to the flow, the velocity distributions with spatial resolution of 1.8 × 1.8 μm were measured even near the wall in the center plane of the round tube. It was found that the velocities near the tube wall were smaller than the theoretical values calculated by using Poiseuille’s law. It is believed that this disparity is due to micro-scale effects such as interference between particles and the wall, friction at the wall, surface tension and so on.