狭窄血管内流场的PIV实验研究

朱光宇; 袁奇; 陈珍

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狭窄血管内流场的PIV实验研究

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- 狭窄血管内流场的PIV实验研究
- Experimental Investigation on Stenotic Artery Model with PIV Method
- 西安交通大学学报 2010年44卷第6期页码：120-124
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
  
  : 2009-11-12. 作者简介: 朱光宇(1985-),男,硕士生;袁奇(联系人),男,教授,博士生导师. 基金项目: 国家自然科学基金资助项目(10672131);教育部留学归国人员科研启动基金资助项目(2006)
- DOI：
  中图分类号： Q811.6
- 网络首发：2010-06-10，
  
  纸质出版：2010
- 稿件说明：
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朱光宇, 袁奇, 陈珍. 狭窄血管内流场的PIV实验研究[J]. 西安交通大学学报, 2010,44(6):120-124.

Experimental Investigation on Stenotic Artery Model with PIV Method[J]. 2010, 44(6): 120-124.
朱光宇, 袁奇, 陈珍. 狭窄血管内流场的PIV实验研究[J]. 西安交通大学学报, 2010,44(6):120-124. DOI：

Experimental Investigation on Stenotic Artery Model with PIV Method[J]. 2010, 44(6): 120-124. DOI：

摘要

为了对狭窄血管内的剪切应力等流动力学参数及流场形态进行可视化测量

利用三维粒子速度场仪在不同雷诺数下对50%狭窄的颈动脉血管内的流场及剪切应力等流动参数进行了测量.实验结果表明

血管狭窄下游出现了较大范围低剪切应力区域

该区域内剪切应力值低于多数研究认为的能够避免血管内皮细胞损伤的最低值0.4 Pa(4 dyn/cm

).此结果支持了低剪切应力在血栓形成中起着重要作用的观点

同时血管狭窄处出现了较小范围的高剪切应力梯度区域

狭窄下游的涡流则会不断卷吸部分血液反复通过此区域造成血液成分受损

加速斑块的形成.

Abstract

Three-dimensional particle image velocimetry(3D-PIV)is applied in the artery model with a mild stenosis to investigate the flow field under different Reynolds number. A large area of low shear stress is observed at the stenosis downstream where plaque and stenosis are prone to evoke. This result verifies the hypothesis that low shear stress(less than 0.4 Pa(4 dyn/cm

))is vital in the formation of plaque and thrombosis. A high shear stress area is also observed at the stenosis position

and high shear stress gradient area exists at the boundary of low shear stress area and high shear stress area. Vortex at the downstream may rollback some blood through the high shear stress gradient area repeatedly and bring about damage to the blood ingredients

subsequently speed up the development of plaque.

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references

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