This paper presents an experimental study of the laminar flow of a non-Newtonian fluid through 75% (by area reduction) stenotic tubes. The fluid behaviour was described by the Herschel Bulkey non-Newtonian model. The non-Newtonian fluids were aqueous solutions of 0.1% Carbopol 940. Upstream flow conditions were steady and spanned a range of generalized Reynolds numbers Reg from 0.20 to 13.66. The velocity profiles were measured with a Laser Doppler Anemometry (LDA). This study allows us to see locally the influence of the geometry and the non-Newtonian character of the fluid on the velocity profiles, the pressure drops and flow resistance. From the experimental data, the frictional resistance decreases with increasing generalized Reynolds number Reg and resistance gave a weak value in a stenotic tube as compared to the flow in a simple tube. At the level of stenosis, a correlation relating of the Euler number to the generalized Reynolds number is developed. To compare the upstream and downstream parts of the stenosis, it is preferable to represent the pressure drops by the friction factor f. This factor f in upstream and downstream decreases linearly with the generalized Reynolds number Reg.

本文介绍了非牛顿流体层流通过 75%（按面积减少）狭窄管的实验研究。流体行为由 Herschel Bulkey 非牛顿模型描述。非牛顿流体是 0.1% Carbopol 940 的水溶液。上游流动条件稳定，并跨越了从 0.20 到 13.66 的广义雷诺数 Reg 范围。用激光多普勒测速仪 (LDA) 测量速度剖面。这项研究使我们能够局部地看到几何形状和流体的非牛顿特性对速度分布、压降和流动阻力的影响。从实验数据来看，摩擦阻力随着广义雷诺数 Reg 的增加而降低，与简单管中的流动相比，狭窄管中的阻力值较弱。在狭窄的水平，欧拉数与广义雷诺数的相关性得到发展。为了比较狭窄的上游和下游部分，最好用摩擦系数 f 来表示压降。上游和下游的因子 f 随广义雷诺数 Reg 线性减小。