| Abstrakt: |
This study is focused on measurement of velocity fields by the planar PIV experimental method. Velocity fields are measured within rigid blood vessel models with stenoses of different distances between each other. Stenoses of two different geometries, a symmetric and an asymmetric, though with the same 75% area reduction, are used. The vessel models are made of transparent silicone elastomer with low refractive index using external PMMA casting box with a 3D printed inner negative mould made of water soluble PVA material. Optical distortion on the curved inner wall of the vessel model is eliminated using a working fluid which has the refractive index of the same value as the model does. In order to match the refractive indices to each other, a water-glycerol solution mixed at an appropriate ratio was used as the working fluid. For simplicity of the experimental setup, a continuous laser diode was used as light source. Velocity fields were measured within five vessel models with stenoses: one model with a single symmetric stenosis, two models with double symmetric stenoses at different distances, and two models with a combination of symmetric and asymmetric stenosis at different distances. For each model, three steady flow regimes were measured with volume flow rates of 9, 13.5, and 18 ml/s, corresponding to Reynolds numbers of 83, 124, and 165 respectively. [ABSTRACT FROM AUTHOR] |
