显微PIV法研究微流动装置的特征
Along with the rapid growth of research of microfluidics, monitoring and understanding micro flowbehavior is a challenge for researchers. Particle Image Velocimetry (PIV), a powerful tool thatmakes flow visible, was extended to microscale by Santiago et al. 1998. In this paper, we presentedthe micro Particle Image Velocimetry (μ PIV) system at Nanyang Technological University (NTU),its calibration and characterizations of microfluidic devices using μ PIV. Since the fully developedmicrochannel flow has been well investigated, it is suitable to calibrate the measurements of μ PIV.In our experiment, an in-channel microdispenser fabricated on printed circuit board is used to form amicrochannel. A syringe pump forces water that contains fluorescent particles. The flow field is obtainedby μ PIV. At the same time, a three-dimensional model with ANSYS/FLOTRAN was used.The comparison between the two results demonstrates that our μ PIV system works well. Furthermorewe use this system to characterize a Tesla valve - a non-moving part valve. The valve consistsof a fluid channel structure that has rectification property, which favors forward flow while hampersreverse flow. The velocity fields are also validated by ANSYS/FLOTRAN.