Abstract
High time-resolution flow field measurement in two micro-channels with complex shape is performed by a micro digital holographic particle-tracking velocimetry (micro-DHPTV). The first one has Y-junction, which is cobining from two inlets to one outlet. The two laminar velocity profiles in inlet region merged one laminar velocity profile. The second one has convergence region, which become diverge flow after the flow is once converging. Two re-circulation regions are caused at divergence region. Consequently, approximately 250 velocity vectors in the both case can be obtained instantaneously. For micro-channel with the convergence region, two re-circulation regions at divergence point are captured from the three-dimensional vector field, which the axis of re-circular vortices have some alignment.
