脈動流中における軸対称狭さく回りの壁せん断応力の変動

概要

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The distribution of wall shear stress in the developing process occlusion in an arterial wall has been experimentally studied using an electrochemical method in laminar pulsating flow. The configuration of the flow model is axisymmetric stenosis expressed by the cosine curve. The wall shear stress around the narrowest section of stenosis changes more steeply at period of increasing flow rate. The wall shear stress just downstream of the narrowest section suddenly decreases and has a negative value, and the flow separates there. Around the separation point just downstream of the stenosis, the oscillation shear index has a finite value ; the flow direction periodically changes. Furthermore, the gradient of wall shear stress with respect to the tube axis is very high. Therefore, the change in wall shear stress and its direction of action periodically changes at the region where vascular disease would be anticipated.
社団法人日本機械学会の論文
1992-10-25