超声微流混合器内流场试验  

Experimental Research on Microfluidics Field in Micromixer Induced by Ultrasound

作　　者：魏守水[1] 姜春香[1] 邹楠[1] WERELEY Steve T 

机构地区：[1]山东大学控制科学与工程学院,济南250061 [2]普渡大学机械工程学院

出　　处：《机械工程学报》2009年第12期237-241,共5页Journal of Mechanical Engineering

基　　金：山东省优秀中青年科学家奖励基金(2004BS05006);山东省自然科学基金(2007A0016)资助项目

摘　　要：制作超声微流混合器,该混合器混合腔直径6mm,深60μm,振动膜厚和压电层厚210μm,测量辅助立管高度2cm。计算该混合器不同的振动模态,利用粒子图像技术测量实际振动模态图和流场图,分析模态计算结果与试验的误差原因。试验结果表明,混合器在超声激励下腔体内存在平面旋状结构;环流边界处有明显地微粒汇聚现象;一阶模态振动会产生净压差。最后得到压差的高度与压电驱动电压的近似关系。An ultrasonic micromixer consisting of a mixing chamber of 6 mm diameter and 60 μm high, a 210 μm thick lead-zirconate-titanate （PZT） actuator and four 2 cm vertical tubes, is fabricated for experimental research. The resonant modes of the diaphragm are computed and the error is analyzed. A microfluid flow field characterization is performed with particle image velocity （PIV） by using a laser scanning convex microscope. The vortices and the particle focuses along the boundary of the flow field within the chamber are observed; and hydraulic pressure difference and the relation between the difference and driving voltage across the ultrasonic transducer are obtained when the micromixer works in its first order mode.

关 键 词：微流体 微混合器 粒子图像测速 超声驱动 

分 类 号：TB552[理学—物理]