• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 2009, Vol. 45 ›› Issue (12): 237-241.

• 论文 • 上一篇    下一篇

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超声微流混合器内流场试验

魏守水;姜春香;邹楠;WERELEY Steve T   

  1. 山东大学控制科学与工程学院;普渡大学机械工程学院
  • 发布日期:2009-12-15

Experimental Research on Microfluidics Field in Micromixer Induced by Ultrasound

WEI Shoushui;JIANG Chunxiang;ZOU Nan;WERELEY Steve T   

  1. College of Control Science and Engineering, Shandong University School of Mechanical Engineering, Purdue University
  • Published:2009-12-15

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摘要： 制作超声微流混合器，该混合器混合腔直径6 mm，深60 μm，振动膜厚和压电层厚210 μm，测量辅助立管高度2 cm。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。

关键词: 超声驱动, 粒子图像测速, 微混合器, 微流体

Abstract: 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.

Key words: Microfluidics, Micromixer, Particle image velocimetry, Ultrasonic driving

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