Measurements of velocity and wall shear stress inside a PTFE vascular graft model under steady flow conditions
Measurements of velocity and wall shear stress inside a PTFE vascular graft model under steady flow conditions
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DOI：
10.1115/1.2796079
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发表时间：
1997-05-01
影响因子：
1.7
通讯作者：
Zarins, CK
中科院分区：
文献类型：
--
作者：
Loth, F;Jones, SA;Zarins, CK
在稳态流动条件下，利用激光多普勒测速仪研究了聚四氟乙烯（PTFE）犬动脉端侧旁路移植物模型内的流场。构建解剖学上真实的体外模型，以纳入体内犬吻合几何结构的主要几何特征，最明显的是移植物直径大于宿主动脉直径。基于宿主动脉直径的雷诺数208处的速度测量结果表明，流场本质上是三维的。根据近壁速度梯度计算的壁面剪切应力分布显示，在中平面处，在驻点附近，移植物对面的壁上有一个相对较低的壁面剪切应力区域，该区域的轴向长度约为一个动脉直径。该低壁面剪切应力区域延伸至侧壁、缝合线和沿着PTFE移植物，其中PTFE移植物在中平面处的轴向长度大于两个动脉直径。这里提出的移植模型内的速度分布提供了一个数据集，非常适合验证这种类型的模型上的数值解。
The flow field inside a model of a polytetrafluoroethylene (PTFE) canine artery end-to-side bypass graft was studied under steady flow conditions using laser-Doppler anemometry. The anatomically realistic in vitro model was constructed to incorporate the major geometric features of the in vivo canine anastomosis geometry, most notably a larger graft than host artery diameter. The velocity measurements at Reynolds number 208, based on the host artery diameter show the flow field to be three dimensional in nature. The wall shear stress distribution computed from the near-wall velocity gradients, reveals a relatively low wall shear stress region on the wall opposite to the graft near the stagnation point approximately one artery diameter in axial length at the midplane. This low wall shear stress region extends to the sidewalls, suture lines, and along the PTFE graft where its axial length at the midplane is more than two artery diameters. The velocity distribution inside the graft model presented here provides a data set well suited for validation of numerical solutions on a model of this type.