Characterization and evolution poststenotic flow disturbances.
Characterization and evolution poststenotic flow disturbances.
复制标题
狭窄后血流扰动的特征和演变。
DOI：
10.1016/0021-9290(81)90038-5
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发表时间：
1981
影响因子：
2.4
通讯作者：
D. Giddens
中科院分区：
文献类型：
--
作者：
A. Khalifa;D. Giddens
利用激光多普勒风速仪测量树脂玻璃管中心线上沿着的流速，研究了狭窄后血流扰动的演变。正弦速度变化，叠加在一个向前的平均流量，采用和频率参数和峰值雷诺数近似值的狗主动脉的典型。研究了横截面积减少25%、50%和75%的轮廓狭窄。结果表明存在三种类型的流动扰动：相干结构与每个流动周期的启动;从剪切层远端收缩产生的周期性扰动;和非平稳湍流。数据分析方法，允许准确的分类的干扰。连贯的“起始结构”可能与降低发展中动脉粥样硬化斑块的识别阈值有关。
The evolution of poststenotic flow disturbances was studied using a laser Doppler anemometer for the measurement of velocity along the centerline of a Plexiglas tube. A sinusoidal velocity variation, superimposed upon a forward mean flow, was employed; and the frequency parameter and peak Reynolds number approximated values typical of the dog aorta. Contoured stenoses of 25, 50 and 75% reduction in cross-sectional area were studied. Results demonstrate the presence of three types of flow disturbance: a coherent structure associated with the initiation of each flow cycle; a periodic disturbance arising from the shear layer distal to the constriction; and nonstationary turbulence. Data analysis methods which allow accurate classification of disturbances are presented. The coherent “starting structure” may have relevance in reducing the threshold of recognition of developing atherosclerotic plaques.