大動脈弓における拍動流の推移

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Laser Doppler velocity measurements were performed on developing pulsatile flow in a strongly curved tube under flow conditions characteristic of the aortic arch flow (curvature ratio of 1/3, Womersley parameter of 12 and 18, peak Dean number up to 1200). The isovelocity contour of the axial direction shows the potential vortex near the entrance, and the highest velocity occurs near the inner wall. Further downstream, the maximum axial velocity shifts towards the outer wall. During the deceleration phase, reverse axial flow occurs near the inner wall, and further downstream, the region of reverse axial flow in the cross-section slightly expands outward from the inner wall. The appearance of reverse axial flow contributes to the oscillatory shear index (OSI). The values of OSI at the inner wall of the curvature, which evaluate the reversed wall shear stress, increase with flow development and are influenced considerably by the curvature ratio. The values of OSI are higher at the site of atherosclerotic formation (intimal thickness) found in the aortic arch of the rabbit.
一般社団法人日本機械学会の論文
1990-12-25

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