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Computational fluid dynamics investigation of particle inhalability.
Anthony TR; Flynn MR
J Aerosol Sci 2006 Jan; 36:750-765
This study uses computational fluid dynamics to investigate particle aspiration at the low air velocities typical of occupational settings. A realistic representation of a human head on a simpler geometric torso was positioned facing the wind(0.2,0.4ms-1), and breathing was simulated using constant inhalation(1.8,4.3ms-1). Aspiration was simulated using laminar transport for particles 0.3-116 um. Results from the 0.4ms-1freestream and 4.3ms-1inhalation rate compared well with results from the literature for smaller particles. For particles >= 68um, simulations yielded smaller aspiration efficiencies than reported in experiments. For all low velocity conditions studied, the aspiration efficiency curve dropped well below the 50% recommended by the ACGIH in the forward-facing orientation. Additional investigation of aspiration efficiency at other orientations relative to the wind is recommended to fully investigate aspiration efficiency for large particles in occupational environments.
Particulates; Airborne-particles; Air-contamination; Gravimetric-analysis; Aerosols; Aerosol-particles; Computer-models; Models; Author Keywords: Size-selective sampling; Inhalable particles; Modeling; Computational fluid dynamics
University of North Carolina, Department of Environmental Sciences and Engineering, Chapel Hill, North Carolina, USA
Research Tools and Approaches: Exposure Assessment Methods
Journal of Aerosol Science
University of North Carolina Chapel Hill
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division