摘要
采用Micro-PIV技术,以边长800μm方形截面平角齿形微灌滴头内流微通道为对象,对微通道内流体运动进行了测量。实验使用10x显微物镜、14位灰阶PCO1600相机、3μm荧光示踪粒子和仅允许610nm红光透过的滤光镜相配合、获取了清晰的粒子图像,解决了相机与PIV系统的匹配问题,提高了图像信噪比。在图像处理中使用多次测量取平均的方法消除示踪粒子的布朗运动影响,运用系综互相关算法获取流场速度分布和流线图。实验发现微通道内各齿间流动结构基本一致,即通道内流充分发展后是一种周期性流动;通道顶角和转角内侧存在低速涡旋区,其涡旋结构和尺度随时间和Re变化而变化;颗粒在低速涡旋区易发生沉积,是造成堵塞的主要原因。
Using micro-fluidic particle image velocimetry （micro-PIV） technique, the paper investigated measurements for the square micro-channel with side lengths of 800 μm. To attain distinct particle image, solve the problems of matching camera with PIV system and improve the image＇s signal-to-noise ratio, the research adopted 10x microscope, 14-bit CCD camera system, 3μm fluorescent particles and filter lens that only allow 610nm red light penetration. In the image processing, Brownian motion＇s impact on tracing particles was eliminated by the average of images. Using ensemble correlation arithmetic acquired velocity distribution and velocity streamline. The results show that jags＇ flow structure is basically consistent inside the micro-channel. The fully developed internal flow in the channel is a cycling movement. There exists low speed vortex area in the micro-channel＇s flat top and corner, whose vortex structure and size depend on time and Reynolds number. The particles are vulnerable to deposit in the low-speed vortex area, which proves the main factor for block.
出处
《实验流体力学》
EI
CAS
CSCD
北大核心
2010年第1期15-19,共5页
Journal of Experiments in Fluid Mechanics
基金
国家自然科学基金(10972176)
新疆维吾尔自治区科技攻关重点项目(200833121)
作者简介
金文（1967-），女，吉林扶余人，博士生，教授，省教学名师，国家级精品课程负责人，获省科技进步一等奖1项。研究方向：微尺度流体力学。
通讯作者：张鸿雁。E—mail：zhanghongyan@xauat．edu．cn
