Impaction and sedimentation deposition of fibers in airways.
Yu-CP; Asgharian-B; Yen-BM
Am Ind Hyg Assoc J 1986 Feb; 47(2):72-77
The impaction and sedimentation of airborne fibers in model airways was assessed using Jeffrey's theory of particle motion with regard to deposition efficiency. The model was compared to equations derived for deposition efficiencies based upon the use of a horizontal elutriator with a divergent cross section and those based upon the use of a cascade impactor. The model assumed the fiber in the airway to be a prolate ellipsoid suspended in a laminar air flow with a constant velocity gradient. Equations for the determination of orientation and velocity were detailed based upon this assumption, and geometrical descriptions of the impaction and sedimentation angles were derived using these equations. Theoretical data for the sedimentation and impaction of fibers of varying diameters derived according to the conditions of the described model were compared to experimental data obtained for the impaction deposition of glass fibers at the carina of excised calf lungs. The proposed model was comparable to the equations proposed by other studies for the calculation of sedimentation deposition in the lung and showed good agreement with experimental results for impaction deposition.
NIOSH-Publication; NIOSH-Grant; Airborne-particles; Asbestosis; Pulmonary-function; Laboratory-animals; Physical-properties; Fibrous-dusts; Mathematical-models
American Industrial Hygiene Association Journal
State University of New York at Buffalo, Buffalo, New York