不对称入口速度剖面对两种类型颈动脉分叉模型外侧壁切应力的影响  

Effect of Asymmetrical Entry Velocity Profile on Outer Wall Shear Stress in Two Carotid Bifurcation Models

作　　者：杨烁[1] 丁祖荣[1] 孙刚[1] 王勇[1] 

机构地区：[1]上海交通大学 工程力学系,上海200030

出　　处：《力学季刊》2005年第4期604-608,共5页Chinese Quarterly of Mechanics

基　　金：国家自然科学基金资助(10272076)

摘　　要：在定常流不对称人口速度剖面条件下,对健康型和致病型颈动脉分叉TF-AHCB模型进行实验和数值模拟研究,发现不对称人口速度剖面的形状对模型外侧壁的低切应力和切应力速度分布有明显影响。在50°模型窦前部的壁面切应力梯度比20°模型高出数倍,当人口速度剖面向颈内动脉偏斜时更可高出10倍以上。这些结果对认识导致动脉粥样硬化斑块的血流动力学因子的影响因素有重要参考价值。In the condition of asymmetrical entry velocity profile on steady flow, the experimental study and numerical simulation on the healthy and pathogenic models of TF-AHCB were performed. It shows that the asymmetrical entry velocity profile obviously affects the low wall shear stress and the gradient of the wall shear stress on the model＇s outer wall. The gradient of the wall shear stress in front of sinus in the model of 50° is several times as high as that in the model of 20°, and can rise up to 10 or more times when entry peak velocity deviates inner. The results are valuable for realizing the hemodynamic factors of artherosclerosis.

关 键 词：颈动脉分叉 壁面切应力 不对称速度剖面 实验模拟 数值模拟 

分 类 号：R318.01[医药卫生—生物医学工程]