磁场对人体三维分叉颈动脉血液流动的影响规律研究
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1.青岛理工大学环境与市政工程学院;2.中山大学附属第八医院;3.上海电力大学能源与机械工程学院

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Effect of magnetic field on blood flow of human three-dimensional bifurcation carotid artery
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    摘要:

    目的 针对越来越多人造电磁场环境的出现,例如高压输电线、磁悬浮列车、核磁共振设备、电磁冶金设备等产生的电磁场环境,选取人体三维分叉颈动脉血液为对象,通过CT影像重构三维血管模型,研究外加均匀磁场对血液动力学行为的影响规律。方法 采用计算流体力学理论和磁流体力学方法,建立了体外均匀磁场对血液流动影响的数学模型,运用多物理场耦合模拟软件COMSOL Multiphysics进行了仿真模拟,探究了磁场强度对血液流动速度、压力和剪切应力的影响。结果 研究结果显示,随着磁场强度的增加,血管中心处的流速受到了更加显著的抑制。壁面压力随着磁场强度的增加而减小,且磁场在血流分叉前对壁面处压力的影响明显,而在血流分叉后对壁面压力的影响减弱。血流进入分支血管后,壁面切应力显著增加,同时磁场对切应力的影响也显著增强。结论 人体血液具有磁流体力学特性,一定强度范围的磁场对血液流动产生了明显的影响,研究成果对设计人造强磁场设备、评估人造磁场环境对人体血液动力学的影响、以及诊断人造磁场环境产生的疾病提供了理论依据。

    Abstract:

    Objective In view of the emergence of more and more artificial electromagnetic field environment, such as high-voltage transmission line, maglev train, nuclear magnetic resonance equipment and electromagnetic metallurgy equipment, the three-dimensional bifurcation carotid blood of human body is selected as the object. The three-dimensional vascular model is reconstructed through CT image to study the influence of external uniform magnetic field on hemodynamic behavior. Methods The mathematical model of blood flow with external uniform magnetic field is established by using the theory of computational fluid dynamics and the method of magnetohydrodynamics. The simulation is carried out by using the multi physical field coupling simulation software COMSOL Multiphysics to explore the effects of magnetic field intensity on blood flow velocity, pressure and shear stress. Results The results show that the magnetic field significantly suppresses the velocity at the center of the blood vessel with the increase of magnetic field intensity. The wall pressure decreases with the increase of magnetic field intensity, and the influence of magnetic field on wall pressure before blood flow bifurcation is obvious, but the influence on wall pressure after blood flow bifurcation is weak. After the blood flow enters the branch vessel, the wall shear stress increases significantly, and the effect of magnetic field on the shear stress also increases significantly. Conclusions Human blood has magnetohydrodynamic characteristics, and the magnetic field in a certain intensity range has a significant impact on blood flow. The research results provide a theoretical basis for the design of artificial equipment with high intensity magnetic field, evaluation of the effects of the artificial magnetic field on human hemodynamics, and diagnosis of the diseases caused by artificial magnetic field.

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  • 收稿日期:2021-11-03
  • 最后修改日期:2021-12-24
  • 录用日期:2022-01-04
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