Bjorno L, Pettersson H
Acta Radiol Diagn (Stockh). 1976 Nov;17(6):749-62. doi: 10.1177/028418517601700601.
Experiments and a simple theoretical analysis have been performed concerning the flow through circular (stenosis) and annular (catheter piece) lumen area reduction of rigid- and elastic-walled vessels. Both steady and pulsatile flow at various volumetric flow rates were investigated. A good agreement between the experimental and the analytical results has been found. A critical annular lumen area reduction exists on a par with the well-known critical stenosis. The strongest reduction in pressure and in volumetric flow rate was caused by the catheter pieces, compared with the stenoses. The per cent reduction in pulse mean pressure and in volumetric mean velocity at pulsatile flow was equal to the per cent reduction in pressure and volumetric mean velocity at steady flow. The influence of the geometrical shape of the stenoses and the catheter pieces is further discussed.
针对刚性壁和弹性壁血管中圆形（狭窄）和环形（导管段）管腔面积减小情况下的流动，进行了实验和简单的理论分析。研究了不同体积流量下的稳定流和脉动流。实验结果与分析结果吻合良好。与众所周知的临界狭窄相当，存在一个临界环形管腔面积减小值。与狭窄相比，导管段导致的压力和体积流量的降低最为显著。脉动流时脉冲平均压力和体积平均速度的降低百分比与稳定流时压力和体积平均速度的降低百分比相等。进一步讨论了狭窄和导管段几何形状的影响。
