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FIBER DEPOSITION ALONG AIRWAY WALLS: EFFECTS OF FIBER CROSS-SECTION ON ROTATIONAL INTERCEPTION
Citation:
Johnson, D. AND T. Martonen. FIBER DEPOSITION ALONG AIRWAY WALLS: EFFECTS OF FIBER CROSS-SECTION ON ROTATIONAL INTERCEPTION. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-94/213 (NTIS PB94163920), 1993.
Description:
Airborne fibers present a threat to human health. athematical model of fiber motion is presented which suggests that significant rotational deposition occurs along airway walls downstream of human lung bifurcations. he predictions are validated by cited experimental data. oth prolate ellipsoids of revolution (PER) and triaxial ellipsoids will be deposited efficiently; but, triaxial ellipsoids exhibit rotational behavior significantly different from PER particles. eviation from a circular cross-section results in enhanced deposition via the interception process, so that triaxial ellipsoids will be deposited more readily within the lung airways than PER particles of comparable dimensions. he theoretical deposition efficiency within a fluid layer immediately adjacent to an airway wall is much higher for triaxial ellipsoids, approaching 100% as compared with a maximum g 64% for PER particles. he data have been integrated into risk assessment model for airborne fibers.
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FIBER DEPOSITION ALONG AIRWAY WALLS: EFFECTS OF FIBER CROSS-SECTION ON ROTATIONAL INTERCEPTION