軸対称狭さく近傍の流れと壁面せん断応力

概要

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The flow situation, particularly the wall shear stress, in the developing process of the occlusion in an arterial wall has been studied using an experimental electrochemical method in the range of laminar flow. The configuration of stenosis is symmetric and is expressed by a cosine curve. In the experiment, four stenosis ratios are employed, i.e., δ/R=0.1, 0.2, 0.3 and 0.5, where δ and R are the height of the stenosis and the radius of the upstream straight tube, respectively. The length of the stenosis is the same as the diameter of the upstream straight tube. Also, this flow has been analysed by a finite-element method. The wall shear stress steeply increases at a point just upstream of the narrowest constriction. Just downstream, the wall shear stress suddenly decreases and is minimum at a point downstream of the stenosis. In the case of severe stenosis, the wall shear stress becomes negative, and the flow finally separates at a point downstream of the stenosis. Therefore, the wall shear stress sharply changes around the stenosis. The experimental results agree with the numerical ones.
社団法人日本機械学会の論文
1991-10-25