摘要
采用显微粒子图像测速技术（M icro-PIV）获取全场速度分布的基础上测量了水力直径为0.4 mm的长直微通道内的水流量。实验采用532 nm波长的双脉冲激光对粒径为3μm的荧光粒子进行照明，通过在电荷耦合器件（CCD）相机前加装10倍显微物镜，获取具有较高空间分辨率的粒子运动图像。利用位移求解算法得到雷诺数分别为100和200时的通道中位面的速度场分布。结果表明，除近壁区外，通道内中位面速度分布与方形截面理论速度廓线一致。由此利用方形通道的层流解析表达式获得不同位置处的截面流量的离散分布值，对其求算数平均获得通道水流量。
Based on the measurements of velocity field by using microscopic particle image velocimetry （ Micro-PIV ）, the water flow rates in microchannel of 0.4mm hydraulic diameter are obtained. In the experiments, the fluorescent tracking particles of 3um diameter are illustrated by double pulse laser of 532nm wavelength. With installation of microscopic objective with amplitude of 10× in front of CCD camera, particle motion images with high spatial resolution are obtained. With the displacement arithmatic, the velocity fields on median plane under Reynolds number of 100 and 200 are gained. The results show that the measuring velocity distributions on medial plane in microchannel are consistent with the theoretical velocity profiles of square duct except those near wall. Therefore, a group of discrete values of flow rate at different coordinate positions are approached by employing the analytical expression of laminar flow in square duct, and hence the mean flow rates are calculated.
出处
《计量学报》
CSCD
北大核心
2009年第1期25-28,共4页
Acta Metrologica Sinica
基金
国家自然科学基金（10702066）
教育部博士点基金（20030698004）
