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Transport and deposition of ellipsoidal fibers in low Reynolds number flows.

Authors
Tian-L; Ahmadi-G; Wang-Z; Hopke-PK
Source
J Aerosol Sci 2012 Mar; 45:1-18
NIOSHTIC No.
20044498
Abstract
The motion of elongated, ellipsoidal fibers in low Reynolds number flows was studied using a computational modeling approach. The computer model resolved the coupled translational and rotational motion of fibers in laminar flows. The computational model was applied in a circular duct and the transport and deposition of ellipsoidal fibers with different sizes and aspect ratios were simulated. An experimental setup was also developed and deposition of glass fibers in a pipe flow in laminar flow regime was measured. A fiber classifier was used to generate fibers with different aspect ratios in controlled condition. The computational model predictions were compared with the experimental data and good agreement was observed. It was found that the flows hear rate, the fiber aspect ratio, and the particle-to-fluid density ratio significantly affect the transport and deposition of ellipsoidal fibers. It was also found that the computational model should account for the duct flow entrance region in order to provide physically realistic predictions. Attention was given to comparing the effectiveness of using equivalent spheres to approximate the elongated fibers. Several commonly used equivalent spheres were studied, and their suitability for characterizing motion of ellipsoidal fiber particles in the laminar flow was studied.
Keywords
Aerosols; Aerosol-particles; Fibrous-dusts; Inhalants; Airborne-fibers; Air-sampling; Exposure-levels; Risk-factors; Asbestos-fibers; Asbestos-dust; Particulates; Analytical-processes; Computer-models; Computer-software; Computers; Models; Air-flow; Simulation-methods; Author Keywords: Ellipsoidal particle; Fiber transport; Fiber deposition; Sedimentation; Laminar flow
CODEN
JALSB7
Publication Date
20120301
Document Type
Journal Article
Funding Type
Grant
Fiscal Year
2012
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-003900
ISSN
0021-8502
Source Name
Journal of Aerosol Science
State
NM
Performing Organization
Lovelace Biomedical & Environmental Research, Albuquerque, New Mexico
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