Abstract
Hele-Shaw flows around micro obstacles are visualized by using micro streaklines generated by two-beam interference technique of UV laser, in combination with the photochromic method. This type of flow is a model of blood flow in the lung. Two types of flow channels are used: (1) the Hele-Shaw cell on the slide glass containing irregular shaped obstacles of about 300μm in size, (2) the microfluidic PDMS chip containing 200μm diameter cylinders. The flow in the both cells are visualized by streaklines with their interval in the order from 80μm to 90μm. It was found that the visualized image agrees with the potential streaklines calculated by a panel method.
