Abstract
Bi-leaflet Mechanical Heart Valve (BMHV) is widely used in surgically heart valve replacement in worldwide. The main complication of the BMHV is that BMHV leaded to the formation of blood clotting known as thrombosis. Vortex Generator (VG) is used to improve the performance of the BMHV by delaying the turbulence that activated the platelet and hemolysis. This paper presents various configuration of VG to enhance the performance of BMHV. In this Computational Fluid Dynamic (CFD) approach, a simplified prosthetic heart valve is used to investigate the performance of BMHV with different orientation of VG. As a result, the fluid is passed through the leaflets with VG. The pressure drop is decreased between the position of after leaflets and before leaflets. In the present study, four different configurations of VG are reviewed, which are without VG, Co-counter Equally Spaced VG, Straight Equally Spaced VG and Counter-rotating Far Spaced VG. In the other hand, this present study also investigates the pulsatile turbulent transient flow in simplified prosthetic heart valve with no VG and the best configuration of VG in the previous study. In the present study, Co-counter Equally Spaced VG is the best configuration and it contributed 42.62% of improvement in pressure drop across the leaflets. Besides that, Co-counter Equally Spaced provided 52.96% and 7.82% reduction in Turbulence Shear Stress and Turbulence Kinetic Energy respectively. In the summary, the pressure drop, turbulence kinetic energy and turbulence shear stress are significantly reduced due to the existence of VG. VG is a crucial device to enhance the performance of BMHV by delaying early separation and thus turbulence reduced.
Published Version
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