title: Steady flow development past valve prostheses in a model human aorta. II. Tilting disc valves.
abstract: The flow development in the model human aorta with uniform entry as well as with centrally occluding valves mounted at the root of the aorta was described in Part I of this two-paper sequence. Part II deals with the flow development in the model aorta with tilting disc valves mounted at the root of the aorta. Bjork-Shiley and Hall-Kaster tilting disc valves were mounted in three different orientations with respect to the root of the aorta. The velocity profiles and turbulent stresses were measured with laser-Doppler anemometry. Our results under steady flow conditions in the model human aorta show quantitatively that the flow development in the ascending aorta as well as in the brachio-cephalic artery are strongly dependent on the orientation of the tilting disc valves. With the valves tilting towards the outer wall of curvature, our results suggest a tendency for flow separation at the flow divider region of the brachio-cephalic artery.
mesh_terms: D001011:Aorta / Q000502:physiology*; D001783:Blood Flow Velocity; D006350:Heart Valve Prosthesis; D006801:Humans; D008953:Models, Anatomic; D012212:Rheology