A numerical and experimental analysis of the flow field in a two-dimensional model of the human carotid artery bifurcation.
A numerical and experimental analysis of the flow field in a two-dimensional model of the human carotid artery bifurcation.
复制标题
人体颈动脉分叉二维模型中流场的数值和实验分析。
DOI：
10.1016/0021-9290(87)90250-8
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发表时间：
1987
影响因子：
2.4
通讯作者：
R. S. Reneman
中科院分区：
文献类型：
--
作者：
C. Rindt;F. Vosse;A. A. Steenhoven;J. J. Janssen;R. S. Reneman
轴向速度进行了测量，在一个扩大的，二维的，刚性模型的颈动脉分叉的激光多普勒风速计，在稳定和非稳定的流动条件下。此外，一个数值模型的基础上，有限元近似的Navier-Stokes方程和连续性方程。从这项研究看来，数值预测的速度与实验获得的值吻合得很好。此外，分叉几乎不影响主分支（颈总动脉）中的上游流，在子分支（颈内动脉和颈外动脉）的分隔壁处观察到高速度梯度，并且在这些分支的非分隔壁附近存在大的反向流区。对于稳定血流，颈内动脉（颈动脉窦）入口处该区的最大直径约为该分支局部直径的25%。对于不稳定流，该区域在流动加速的初始阶段不存在，并且在流动减速结束时最大，最大直径约为颈动脉窦局部直径的50%。
Axial velocities were measured in an enlarged, two-dimensional, rigid model of the carotid artery bifurcation by means of a laser-Doppler anemometer, under both steady and unsteady flow conditions. Also a numerical model was developed, based on the finite element approximation of the Navier-Stokes and continuity equations. From this study it appeared that the numerically predicted velocities agree well with the experimentally obtained values. Besides, the bifurcation hardly influenced the upstream flow in the main branch (common carotid artery), high velocity gradients were observed at the divider walls of the daughter branches (internal and external carotid arteries) and large zones with reversed flow were present near the nondivider walls of these branches. For steady flow the maximal diameter of this zone at the entrance of the internal carotid artery (carotid sinus) was about 25% of the local diameter of this branch. For unsteady flow this zone was absent during the initial phase of flow acceleration and maximal at the end of flow deceleration with a maximal diameter of about 50% of the local diameter of the carotid sinus.