Idelsohn S R, Costa L E, Ponso R
J Biomech. 1985;18(2):97-115. doi: 10.1016/0021-9290(85)90003-x.
The steady flow of blood through three common types of prosthetic heart valves was simulated numerically using the finite element method. The velocity, pressure and stress fields were obtained for the disk-type, tilting-disk and ball-type prosthetic heart valves in aortic position, for increasing Reynolds numbers up to 900, 1500 and 2000 respectively. Computer graphics of calculated velocities are presented, showing in detail the accelerated flow, recirculation and stagnation areas developed in the prosthesis. Maximum wall shear stresses were found at 0.5, 1.4, and 1.2 diameters from the sewing ring downstream for the disk, tilting-disk and ball valves being the values of 55, 18 and 33 dyn cm-2 respectively. In the vicinity of the occluder, maximum shear stresses of 38, 30 and 47 dyn cm-2 respectively were computed. The flow characteristics and performance for each valve are compared, the results are presented in terms of energy loss and maximum shear stress. The velocity and stress fields are compared with in vitro evaluations found in the literature.
采用有限元方法对三种常见类型人工心脏瓣膜中的血液稳定流动进行了数值模拟。分别针对主动脉位置的盘式、倾斜盘式和球型人工心脏瓣膜，在雷诺数增加至900、1500和2000时，获取了速度、压力和应力场。给出了计算速度的计算机图形，详细显示了人工瓣膜中形成的加速流动、再循环和停滞区域。发现盘式、倾斜盘式和球型瓣膜在下游缝合环下游0.5、1.4和1.2个直径处的最大壁面剪应力分别为55、18和33 dyn cm-2。在封堵器附近，分别计算出最大剪应力为38、30和47 dyn cm-2。比较了每个瓣膜的流动特性和性能，并根据能量损失和最大剪应力给出了结果。将速度和应力场与文献中的体外评估结果进行了比较。
