Numerical Study of Bifurcated Blood Flow in Three Different Blood Viscosity Models  

作　　者：吴辉 富荣昌 杨晓玉 李现政 王召耀 WU Hui;FU Rongchang;YANG Xiaoyu;LI Xianzheng;WANG Zhaoyao(School of Mechanical Engineering,Xinjiang University,Urumqi 830000,China)

机构地区：[1]School of Mechanical Engineering,Xinjiang University,Urumqi 830000,China

出　　处：《Journal of Shanghai Jiaotong university(Science)》2023年第4期450-458,共9页上海交通大学学报（英文版）

基　　金：the National Natural Science Foundation of China(No.31460245)。

摘　　要：This study aimed to analyze the hemodynamic effects of bifurcated vessels using different bloodviscosity models.Three-dimensional models of bifurcated vessels in the popliteal artery were constructed basedon CT images,and hemodynamic parameters of the Newtonian,Casson,and two-phase models were calculatedby the computational fluid dynamics method.Blood flowed through the popliteal artery.Blood flow velocitychanged after the bifurcated vessel,with accelerated blood flow velocity in the anterior tibial artery.A lowvelocity vortex region with a region of low wall shear stress(WSS)was generated outside the bifurcated vessel.Local non-Newtonian importance factors of great than 1(i.e.,I_(L)>1)occurred during the cardiac cycle,andI_(L)>1.75 occurred at the beginning and end of the cycle.Compared with the Casson and two-phase models,theNewtonian model has a larger vortex region and lower WSS.Low-velocity vortex regions and low WSS regionsin the bifurcated vessels may contribute to the development of atherosclerosis.Blood exhibited non-Newtonianfluid properties in bifurcated vessels(I_(L)>1),and the effect of non-Newtonian properties was more pronouncedat the beginning and end of heartbeats(I_(L)>1.75).The Newtonian model predicts a higher risk of atherosclerosisformation and the effect of non-Newtonian properties of blood should be considered in hemodynamic studies.

关 键 词：HEMODYNAMICS computational fluid dynamics non-Newtonian fluid non-Newtonian importance factor 

分 类 号：Q66[生物学—生物物理学] R318[医药卫生—生物医学工程]