PIV技术的粒子图像处理方法

以图像相关理论为基础，研究粒子图像测带技术(PIV)的图像处理方法，编制出高精度的处理软件，重建计算模拟的粒子图像位移场，给出了自相关法与互相关法的积相磁与减相关的计算结果，及互相关的误差分析，分析了自相关与互相关区别，得出了互相关法是提高粒子图像测带技术精度的有效方法的结论，因此跨帧技术是PIV技术的发展方向。

利用PIV方法测量半浮区液桥热毛细对流的速度场

本文利用PIV法对硅油液桥热毛细对流的定常的速度场进行了实时测量。为了便于测量,液桥上桥端面采取了铜环中嵌透明材料的方法,从液桥的顶部进行观测。当液桥上下桥有温差时,热毛细对流出现;本实验对于不同上下桥的温差,对液桥横剖面内的速度场分别进行了测量,研究外加温差对于流场速度分布的影响;并且在液桥中取了几个典型横截面进行测量,以期对大Pr数液桥的定常速度场有比较全面的定量的量测。此外,实验结果也可做为数值模拟计算结果的验证。

The near wall velocity measurements in microchannels with different diameter particles by microPIV/PTV. 8th International symposium on PIV

In near wall measurements with microPIV/PTV, whether seeding particles can be effectively used to detect local fluid velocity is a crucial problem. This talk presents our recent measurements in microchannels [1][2]. Based on measured velocity profiles with 200nm and 50nm in pure water, we found that the measured velocity profiles are agreed with the theoretical values in the middle of channel, but large deviations between measured data and theoretical prediction appear close to wall (0.25mm