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首页> 外文期刊>Bulletin of the American Physical Society >APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Spiral blood flows in an idealized 180-degree curved artery model
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APS -70th Annual Meeting of the APS Division of Fluid Dynamics- Event - Spiral blood flows in an idealized 180-degree curved artery model

机译：APS-APS流体动力学分部第70届年会-活动-理想的180度弯曲动脉模型中的螺旋血流

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摘要

Understanding of cardiovascular flows has been greatly advanced by the Magnetic Resonance Velocimetry (MRV) technique and its potential for three-dimensional velocity encoding in regions of anatomic interest. The MRV experiments were performed on a 180-degree curved artery model using a Newtonian blood analog fluid at the Richard M. Lucas Center at Stanford University employing a 3 Tesla General Electric (Discovery 750 MRI system) whole body scanner with an eight-channel cardiac coil. Analysis in two regions of the model-artery was performed for flow with Womersley number=4.2. In the entrance region (or straight-inlet pipe) the unsteady pressure drop per unit length, in-plane vorticity and wall shear stress for the pulsatile, carotid artery-based flow rate waveform were calculated. Along the 180-degree curved pipe (curvature ratio =1/7) the near-wall vorticity and the stretching of the particle paths in the vorticity field are visualized. The resultant flow behavior in the idealized curved artery model is associated with parameters such as Dean number and Womersley number. Additionally, using length scales corresponding to the axial and secondary flow we attempt to understand the mechanisms leading to the formation of various structures observed during the pulsatile flow cycle.
机译：磁共振测速（MRV）技术及其对感兴趣的解剖区域进行三维速度编码的潜力已大大促进了对心血管血流的理解。 MRV实验是在180度弯曲动脉模型上进行的，使用的是斯坦福大学理查德·卢卡斯中心的牛顿血液模拟液，采用3特斯拉通用电气（Discovery 750 MRI系统）全身扫描仪和八通道心脏线圈。用沃默斯利数＝ 4.2在模型动脉的两个区域中进行流动分析。在入口区域（或直管）中，计算了基于脉动，基于颈动脉的流速波形的每单位长度的非稳态压降，面内涡度和壁切应力。沿180度弯曲管（曲率比= 1/7）可以看到近壁涡度和在涡度场中粒子路径的拉伸。理想化的弯曲动脉模型中的合成流动行为与诸如迪安数和沃默斯利数之类的参数相关。此外，使用与轴向流和二次流相对应的长度尺度，我们尝试了解导致在脉动流循环中观察到的各种结构形成的机理。

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