Some flow visualization and laser-Doppler-velocity measurements in a true-to-scale elastic model of a human aortic arch--a new model technique.
Some flow visualization and laser-Doppler-velocity measurements in a true-to-scale elastic model of a human aortic arch--a new model technique.
复制标题
在人体主动脉弓的真实比例弹性模型中进行一些血流可视化和激光多普勒速度测量——一种新的模型技术。
DOI：
10.3233/bir-1992-295-615
复制
发表时间：
1992
期刊：
影响因子：
1.1
通讯作者：
R. Baumgart
中科院分区：
文献类型：
--
作者：
D. Liepsch;St. Moravec;R. Baumgart
为了进一步研究血流动力学对动脉粥样硬化的影响，我们在弹性真实尺寸的硅橡胶主动脉弓模型上进行了血流研究。模特是从一位年轻女子的演员阵容中挑选出来的。使用了一种修正的模型技术。该模型的顺应性与人的主动脉弓相似。在模型中用双分量激光多普勒风速仪测量了定常和脉动流动中的速度，使用的是粘度Eta=3.18 mPas，密度Rho=1.28 kg/m~3的氯化钙溶液，在20℃下，升主动脉内整个周期的时间平均雷诺数为Re=1350。脉动血流的沃姆斯利参数为a=20。升主动脉的脉搏波速度约为c=5.4m/s。讨论了定常和脉动两种情况下的二次流特性。在降主动脉内、升主动脉小范围和主动脉弓分支均可见血流倒流，尤以降主动脉内径为佳。讨论了动脉粥样硬化斑块在优先的局部血流区域的形成。
Flow studies were done in an elastic true-to-scale silicone rubber model of an aortic arch to study further hemodynamic influences on atherosclerosis. The model was prepared from a cast of a young woman. A revised model technique was used. The model had a compliance similar to that of the human aortic arch. Velocity measurements were done in the model with a two component laser-Doppler-anemometer in steady and pulsatile flow using a calcium chloride solution with a viscosity of eta = 3.18 mPas and density of rho = 1.28 kg/m3 at 20 degrees C. The time average Reynolds numbers over a whole cycle in the ascending aorta was Re = 1350. The Womersley parameter for pulsatile flow was a = 20. The pulse wave velocity in the ascending aorta was about c = 5.4 m/sec. The secondary flow behavior was discussed for steady and pulsatile flow. Reverse flows were found, especially along the inner radius of the aortic arch in the descending aorta in steady and pulsatile flow and also in small areas of the ascending aorta and at the branches of the aortic arch. The formation of atherosclerotic plaques at preferred local flow regions is discussed.