抄録
Performance criteria such as Pressure Gradient and Effective Orifice Area (EOA) are influenced by the change of flow passage profile which affect on the generation of vortices and turbulence. Consideration on shear stress is also becoming important if blood trauma is considered.In this presentation, relationship between prosthetic heart valve performance and blood trauma will be discussed through experimental flow analysis of heart valve. Ball, Tilting-Disk, and Bileaflet-type mitral prosthetic heart valve's performance was compared using Pressure Gradient and turbulent shear stress downstream of a valve using LDA system. Turbulent shear stress distribution and shear stress history at immediately downstream of aortic bileaflet mechanical prosthetic heart valves were compared using Dynamic PIV system.Based on the experimental analysis, following conclusion can be made. Valve profile and leaflet opening angle influence on generation of flow separation and turbulence which in turn will affect on Pressure Gradient, turbulent shear stress, and history of turbulent shear stress. Therefore, it is very important to consider detailed analysis of the flow field associated with heart valve.
