Abstract
Introductory concepts regarding the motion of an aerosol particle are given in detail. This includes development of the equations governing drag, settling velocity, hindered settling, and corrections for very small particles. Brownian diffusion is examined, and its importance for particles in the respiratory tract is discussed. Particle inertia and its relation to Stokes number are considered using dimensionless analysis of the governing equations, including the relation to relaxation time and stopping distance. Aerodynamic diameter is introduced from a dimensional similitude perspective. Finally, the importance of electric charge (either induced or space charge) on particle motion in the respiratory tract is considered using dimensionless analysis.
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