通道式微混合器的设计及性能  

Design and Performance of Micromixer in Microchannel

作　　者：王小章[1] 王朝晖[1,2] 张群明[1,2] 王敬[1] 

机构地区：[1]西安交通大学机械工程学院,西安710049 [2]机械制造系统工程国家重点实验室,西安710049

出　　处：《纳米技术与精密工程》2011年第6期555-560,共6页Nanotechnology and Precision Engineering

基　　金：国家自然科学基金资助项目(50775177);中国高校基本科研业务经费专项资金资助项目

摘　　要：利用计算流体力学和数字图像处理技术,研究"Y"型通道式微混合器的结构及混合性能,分析了混合器结构尺寸和流动条件对混合过程的影响.数值模拟结果表明,在混合通道入口夹角为60°、通道宽度为200μm、注入速度为0.02 m/s的流动条件下,可以取得比较满意的混合效果.利用数值模拟对比了扭曲通道混合器、导流块和直通道结构对混合过程的影响,结果表明使用导流块可以显著提高混合效果.依照模拟计算结果,设计并用MEMS工艺制作了双侧壁有内肋块的通道式微混合器,并进行了流体混合实验,观测了混合过程.拍摄混合实验图像,对比标准浓度-图像灰度关系曲线后识别出拍摄点混合指数.识别计算的结果也证实了所设计混合器性能上的优越性.最后对实验结果误差进行了分析,说明了误差来源并给出了相应的改进措施.The structure and performance of micromixer with ＂Y＂ type channel was investigated with computed fluidic dynamics and digital image process. The influences of micromixer such as inlet angle, channel size, and flow velocity of fluid on mixing process, were analyzed. Numerical simulation results reveal that a suitable mixing can be achieved in a microchannel mixer with an inlet-angle of 60°, the width of 200μm, and the in-flow velocity of 0. 02 m/s. Numerical simulations were also executed to compare the performance of mixers such as twisted, blocked, and straight channel. The results indicate that the blocked channel mixer has higher quality than its counterparts. According to the numerical results, a new mixer with convex block arrays on two-side walls was adopted, which can accelerate mixing process by squeezing and spreading the streamline of fluids repeatedly. The new mixer was fabricated with MEMS techniques and mixing experiments were carried out to verify the results Mixing process was also served. The recorded images were processed and the specific index of fluid mixing along the flow axis was identified according to the constructed standard curve in advance. The identified results validate the performance superiority of the new mixer. In the end, the errors in mixing results were analyzed to find their sources, and some useful advice was also proposed to improve the performance of the experiments.

关 键 词：微流控芯片 微混合器 微流体 MEMS 

分 类 号：TN492[电子电信—微电子学与固体电子学]