Analyses of Inevitable Pulsation in Blood Flow and Re-laminarization Process

为了从血液供应效率的观点评价血液流动中脉动的不可避免性，对脉动模拟血液流动进行了实验和数值研究。在加速阶段，随着加速周期的延长，平均压力梯度的幅值减小，减阻率增大，并诱导再层化过程。对于减速期，减阻率随减速期内负平均压力梯度的增大而增大，且减速期越短。

A pulsating simulated blood flow has been experimentally and numerically examined in order to evaluate the inevitability of pulsation in blood flow from a viewpoint of efficiency in blood supply. In the acceleration period, the drag reduction rate increases and re-laminarization process is induced with decreasing the amplitude of the mean pressure gradient in the acceleration phase with the longer acceleration period. As for the deceleration period, the drag reduction rate increases with larger negative mean pressure gradient in the deceleration period with the shorter deceleration period.