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.
出处
《力学季刊》
CSCD
北大核心
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)
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
carotid bifurcation
wall shear stress
asymmetrical entry velocity profile
experimental simulation
numerical simulation
