- Assume that the flow at the level of the trachea is 500 milliliter per second, and that tracheal diameter is 2 cm.
What is the gas speed in the trachea?
- Now look at the bottom illustration. The vertical axis shows how surface area increases from the trachea to the smaller airways.
- Estimate gas speed at the 10th generation.
Also estimate gas speed at the alveolar level, say at generation 20.
- The top figure illustrates the deposition pattern
of particles in the airways as a function of particle diameter.
Pollen are larger than 10 µm, mostly between 20-50 µm.
How far do they penetrate into the airways, where in the airway do they impact?
- Assume that a particle has a diameter of 10 µm: how much more mass does it bring to the airway than a 1 µm particle?