Controlling the Flow Separation in Heart Valves Using Vortex Generators.
Controlling the Flow Separation in Heart Valves Using Vortex Generators.
复制标题
使用涡流发生器控制心脏瓣膜中的流动分离。
DOI：
10.1007/s10439-022-02966-5
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发表时间：
2022
影响因子：
3.8
通讯作者：
Hatoum,Hoda
中科院分区：
文献类型：
--
作者：
Wang,Zhenyu;Dasi,LakshmiPrasad;Hatoum,Hoda
进行了一项全面的计算研究，以研究涡流发生器（VG）应用于机械双叶心脏瓣膜的有效性。将同向旋转和反向旋转VG配置与没有VG的控制阀进行比较。获得详细的流场，并用于阐明基本的流动物理。研究发现，涡流发生器减少了瓣叶上的流动分离，从而降低了心脏瓣膜附近区域的雷诺剪应力（RSS）。同向旋转VG结构在RSS、湍流动能产生和速度分布方面表现出比反向旋转结构更好的性能，特别是在周边射流中。与对照情况相比，同向旋转配置中的血液损伤分数显示出4.7%的降低，而在反向旋转配置中观察到3.7%的增加。应用同向旋转VG的被动流量控制技术说明了帮助减轻导致潜在血液损伤风险的血液动力学因素的巨大潜力。
A comprehensive computational study is performed to investigate the effectiveness of vortex generators (VGs) applied to mechanical bi-leaflet heart valves. Co-rotating and counter-rotating VG configurations are compared to a control valve without VGs. Detailed flow fields are obtained and used to elucidate the underlying flow physics. It was found that VGs reduce flow separation over the leaflets and hence reduce the Reynolds shear stress (RSS) in the vicinity regions of heart valve. The co-rotating VG configuration demonstrates a better performance compared with the counter-rotating configuration in terms of the RSS, turbulent kinetic energy production and velocity distributions, especially in the peripheral jet flows. The fraction of blood damage in the co-rotating configuration shows a 4.7% reduction in comparison to the control case, while a 3.7% increase is observed in the counter-rotating configuration. The passive flow control technique of applying co-rotating VG illustrates a great potential to help mitigate the hemodynamic factors leading to potential blood damage risk.