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"Measured

Source: Modified from Ref. 17.

"Measured

Source: Modified from Ref. 17.

The principle of inertial impaction is employed to sample aerosols aerodynamically for characterization of particle size and will be dealt with theoretically later in this chapter.

Sedimentation of particles follows the principle outlined above in equation (1) in which particles in the Stokes' regime of flow have attained terminal settling velocity. In the airways, this phenomenon occurs under the influence of gravity. The angle of inclination, i/r, of the tube of radius R, on which particles might impact, must be considered in any theoretical assessment of sedimentation (14,19), Landahl's expression for the probability, S, of deposition by sedimentation took the form

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