作　　者： ; ; ; ;

机构地区： 重庆大学通信工程学院

出　　处： 《上海交通大学学报》 2009年第12期1842-1846,共5页

摘　　要： 提出了可在普通实验室制作PDMS圆截面微流动通道的微丝模塑技术,构建了包含受控微流动通道、图像采集和处理的微粒子图像测速(Micro-PIV)系统.利用PIV标准图像验证了以FFT互相关算法和小波消噪算法为基础设计的Micro-PIV分析软件的可靠性.应用聚苯乙烯粒子与纯水配制的悬浮液作为流体,应用Micro-PIV系统提取了圆截面微流动通道内流体的速度向量场,由此计算出通道圆截面上的切应力分布.经流变学理论分析证实,所研制的Micro-PIV系统具有较高的精度.同时表明,采用微丝模塑技术制作的PDMS圆截面微通道具有良好的流动特性. A microwire template technique was presented that can be used for fabricating PDMS microchannels with rounded section in general laboratories. A micro-PIV system containing the hardware and software of controlled microchannels, the image acquisition and processing was constructed. Applying the standardized PIV image, the analysis software of the micro-PIV system that is designed on the base of FFT algorithm for cross-correlation functions and the wavelet-denoising algorithm was verified to be reliable. Using the suspending liquid made up of polystyrene particles and pure water as the fluid, the speed-vector field in the microchannel with rounded section was extracted, from which the shear-stress distribution on the rounded section of the microchannel was figured out. Through the theoretical analysis of theology, the constructed micro-PIV system shows its high accuracy. Also, it shows that the PDMS round-section microchannel made by using the microwire template technique has good flow characteritics.

关 键 词： 微粒子图像测速 微流动 微通道 小波消噪

领　　域： [自动化与计算机技术] [自动化与计算机技术]