Fig. 9.

Quantification of airway obstruction during pressure loading of representative airway segment. Secant distances and number of folds for varying stiffness ratio μ_m/μ_s and varying geometric ratios t_m/R and t_s/R. The red, green, and blue colors correspond to the planar cross sections of Y-branch I in Figure 5. The black curve represents the power relation regression fit of averaged secant distances and fold numbers for all three cross sections. The dashed trend lines in the bottom row indicate agreement with the solution of the idealized circular cross section [71].