Fig. 3From: Effect of cartilaginous rings in tracheal flow with stenosisVelocity contours for streamwise direction for a smooth model and b model with cartilaginous rings (normalized by the maximum velocity in the contraction). c Contour line comparison of both models. It can be observed that the area with reversed flow is significantly larger in the smooth case, particularly that with u/Umax > 0.1Back to article page