VELOCITY-MEASUREMENTS IN STEADY FLOW THROUGH AXISYMMETRIC STENOSES AT MODERATE REYNOLDS-NUMBERS
VELOCITY-MEASUREMENTS IN STEADY FLOW THROUGH AXISYMMETRIC STENOSES AT MODERATE REYNOLDS-NUMBERS
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DOI：
10.1016/0021-9290(83)90065-9
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发表时间：
1983-01-01
影响因子：
2.4
通讯作者：
GIDDENS, DP
中科院分区：
文献类型：
--
作者：
AHMED, SA;GIDDENS, DP
采用激光多普勒测速技术和流动显示技术对刚性圆管轴对称收缩段附近的速度场进行了研究。上游流动条件是稳定的;雷诺数在500-2000范围内，这些值代表了人体较大动脉。研究了25%、50%和75%面积缩小的狭窄。速度剖面足够详细，允许与计算生物流体动力学模型进行比较。壁面剪应力估计从近壁速度梯度，并观察到的poststenotic流扰动的性质进行了讨论。结果表明，作为狭窄发展早期阶段的指标，离散振荡频率的流动扰动可能比湍流更有价值。尽管狭窄程度和雷诺数较高时存在狭窄后湍流，但所产生的壁面剪应力仅比Poiffille值大3-4倍，并且显著小于狭窄内的壁面剪应力。
The velocity field in the neighborhood of axisymmetric constrictions in rigid tubes was investigated using laser Doppler anemometry and flow visualization. Upstream flow conditions were steady; and Reynolds numbers were in the range 500-2000, values which are representative of larger arteries in humans. Stenosis of 25, 50 and 75% area reduction were studied. Velocity profiles are presented in sufficient detail to allow comparison with computational biofluid dynamics models. Wall shear stresses were estimated from the near wall velocity gradient, and the nature of observed poststenotic flow disturbances is discussed. Results indicate that flow disturbances of discrete oscillation frequency may be more valuable than turbulence as an indicator of early stages of stenosis development. Despite the fact that poststenotic turbulence exists for the higher degrees of stenosis and Reynolds numbers, the resulting wall shear stresses are only 3-4 times greater than the Poiseuille value and are considerably less than the wall shear stress within the stenosis itself.