Dynamic Micro PIV Measurement of Transient Flow in Microfluidic Device

This paper reports a new technique of micro-resolution Particle Image Velocimetry (PIV). To investigate transient phenomena in a microfluidic device, a high-speed micro-PIV technique was developed by combining a high-speed camera and a continuous wave (CW) laser. The technique was applied to a micro-counter-current flow, consisting of water and butyl acetate. The velocity fields of water in the micro counter-current flow were visualized for a time resolution of 500μs and a spatial resolution of 2.2 x 2.2 μm. Using the micro-PIV technique, the vortex-like motions of fluorescent particles around the water-butyl acetate interface were captured clearly.