利用PIV研究超声波引起的微流动现象  

INVESTIGATION ON THE MICRO STREAMING GENERATED BY ULTRASOUND TRANSDUCER USING PARTICLE IMAGE VELOCIMETRY

作　　者：郝鹏飞[1] 何枫[1] 王健[1] 张锡文[1] 郭旻[2] 邢婉丽[2] 程京[2] 

机构地区：[1]清华大学工程力学系,北京100084 [2]生物芯片北京国家工程研究中心,北京102206

出　　处：《机械工程学报》2005年第3期64-66,71,共4页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(10272066)

摘　　要：利用微观粒子图像测速技术(Micro-PⅣ)定量研究了位于两块载波片之间的微量液体在压电陶瓷超声换能器(PZT)的激振作用下而产生的微流动现象,超声换能器的激振频率为13 MHz,超声功率为1～5 W/cm2,微量流体的体积为5 μL.试验中利用Micro-PⅣ系统测量了微量流体在不同超声功率下的流场结构.试验结果表明,微量流体在功率超声的激振下,在垂直于超声振动的方向上存在平面旋涡结构,而且声流的最大速度与超声强度成正比.The micro particle image velocimetry (Micro-PIV) is used to investigate the micro acoustic streaming generated by piezoelectric lead-zirconate-titanate(PZT) transducer in the micro water droplet between two parallel glass chips. The ultrasound intensity is in range 1-5 W/cm2 and the frequency is about 1.3 MHz. The volume of micro water drop is about 5μL. The details of flow structures in the water under various ultrasound intensities are obtained by means of Micro-PIV system. The micro vortices are observed in the flow pattern induced by ultrasonic transducer, and the velocity vectors are normal to the vibration direction of ultrasound transducer. The experimental results show the maximum streaming velocity is proportional to the ultrasound intensity.

关 键 词：超声换能器 粒子图像测速技术 微流动 

分 类 号：TB552[理学—物理]