抄録
This paper aims to investigate behavior of pulsatile blood flow in a curved pipe that emulates the Internal Carotid Artery (ICA), which is the frequent occurrence site of an aneurysm. Due to the limit of in vivo experiment, the PIV (Particle Image Velocimetry) is applied to obtain detailed flow information such as complicated secondary flow created by curvature of in vitro experiment. However, the blood flow in the artery is pulsatile, and time-resolution of the conventional PIV is not enough to capture transient behavior of pulsatile flow. Thus, the dynamic PIV is applied to measure unsteady flow. Since the dynamic PIV can provide good resolution in space as well as in time.
As a result of measurement, even with the same Reynolds number, flow characteristics at systole are drastically different from those at diastole. Especially at the time of diastole, the large recirculation flow, which is not seen in steady flow, is observed in the separation region. The secondary flow in the cross section changes according to changes of flow rate in time.
