Figure 9

Spatial dependence of flow variables in a tube with fixed deformation. The area perturbation, flow velocity, pressure and friction coefficient, the wall shear stress, momentum correction factor, the normalised boundary layer thickness and the shape factor are plotted as a function of position in a vessel with fixed deformation of ζ ₀ = 0.2. Three stenoses of different extent (s), (m) and (l) and a series stenosis (d) are compared. The losses are about equal in the cases (m) and (d), which indicates that the pressure loss is mainly viscous. To indicate the flow characteristics in the stenosis we have used the Reynolds number Re _st inside the deformation.