Particle Deposition Due to Turbulent Diffusion in the Upper Respiratory System

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Abstract
Aerosol deposition in the upper respiratory system (trachea to segmental bronchi) was considered and the importance of turbulent diffusion as a deposition mechanism was evaluated. For large particles (diameter greater than about 5 .mu.m), turbulent diffusion is the dominant deposition mechanism in the trachea. Conditions under which turbulent diffusion may be important in successive generations of the pulmonary system were determined. The probability of particle deposition was compared with probabilities of deposition, as determined by the equations generally used in regional deposition models. The analysis was theoretical; no new experimental data was presented.

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