Fig. 8.

Critical areas for 7 µm particles at 15° orientation, by velocity conditions of simulation. The number corresponds to the freestream velocity, in meter per second, and the letter indicates the inhalation velocity at the mouth (R = at-rest at 1.81 m s⁻¹, M = moderate at 4.33 m s⁻¹, and H = heavy at 12.11 m s⁻¹).