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Modeling breathing-zone concentrations of airborne contaminants generated during compressed air spray painting.

Authors
Flynn-MR; Gatano-BL; McKernan-JL; Dunn-KH; Blazicko-BA; Carlton-GN
Source
Ann Occup Hyg 1999 Jan; 43(1):67-76
NIOSHTIC No.
20024446
Abstract
This paper presents a mathematical model to predict breathing-zone concentrations of airborne contaminants generated during compressed air spray painting in cross-flow ventilated booths. The model focuses on characterizing the generation and transport of overspray mist. It extends previous work on conventional spray guns to include exposures generated by HVLP guns. Dimensional analysis and scale model wind-tunnel studies are employed using non-volatile oils, instead of paint, to produce empirical equations for estimating exposure to total mass. Results indicate that a dimensionless breathing zone concentration is a nonlinear function of the ratio of momentum flux of air from the spray gun to the momentum flux of air passing through the projected area of the worker's body. The orientation of the spraying operation within the booth is also very significant. The exposure model requires an estimate of the contaminant generation rate, which is approximated by a simple impactor model. The results represent an initial step in the construction of more realistic models capable of predicting exposure as a mathematical function of the governing parameters.
Keywords
Mathematical-models; Models; Spray-painting; Occupational-exposure; Airborne-particles; Airborne-dusts; Air-contamination; Paint-spraying; Ventilation; Aerosols; Aerosol-particles
CODEN
AOHYA3
Publication Date
19990101
Document Type
Journal Article
Funding Amount
280127
Funding Type
Grant
Fiscal Year
1999
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-002858
Issue of Publication
1
ISSN
0003-4878
Priority Area
Research Tools and Approaches: Exposure Assessment Methods
Source Name
Annals of Occupational Hygiene
State
NC
Performing Organization
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina
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