ABSTRACT
It is important to understand the fluid dynamics of the aortic valve. This chapter explores how the fluid flow affects the leaflet motion. It discusses three fluid dynamic models, presented by Bellhouse, Steenhoven, and Peskin, that describe three different approaches. The phenomena observed in the model are strongly dependent on Strouhal number. The model aortic valve consisted of a rigid Perspex case in which the sinuses were made of either rigid Perspex or flexible silicone rubber. In the two-dimensional model, the leaflet motion was observed for various rates of flow deceleration. In a three-dimensional flow pattern, it has been observed that fluid enters the sinus along the center of the leaflet free edge and leaves near the commissures after being swept around the vortex. The three models provide an understanding of the principles of valve closure. Although these models suggest a mechanism of valve closure, the approach requires modification in certain areas.
