Ojha M, Cobbold R S, Johnston K W, Hummel R L
Institute of Biomedical Engineering, University of Toronto, Ontario, Canada.
J Biomed Eng. 1990 Nov;12(6):463-9. doi: 10.1016/0141-5425(90)90055-r.
A multiple trace photochromic method was used to visualize the pulsatile flow field created by modelled arterial stenoses of 38% and 65% area reductions. Using flow parameters similar to those of a medium sized artery in man, the flow patterns at seven axial locations in relation to the stenosis were simultaneously photographed at various times throughout the flow cycle. With the 65% stenosis, the wall shear stress in the vicinity of the reattachment point was found to fluctuate quite strongly during the turbulent phase of the flow cycle, giving rise to instantaneous shear stresses that were at least eight times larger than those measured upstream. For the 38% stenosis, much smaller shear stresses were observed. These and other results are described in detail.
采用多重轨迹光致变色方法来可视化由面积减少38%和65%的模拟动脉狭窄所产生的脉动流场。使用与人体中动脉大小相似的流动参数，在整个流动周期的不同时刻，同时拍摄了与狭窄相关的七个轴向位置处的流动模式。对于65%的狭窄情况，发现在流动周期的湍流阶段，再附着点附近的壁面剪应力波动非常强烈，产生的瞬时剪应力比上游测量值至少大八倍。对于38%的狭窄情况，观察到的剪应力要小得多。详细描述了这些及其他结果。
