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Flow dynamics and contaminant transport in industrial-type enclosing exhaust hoods.

Authors
Karaismail-E; Celik-I; Guffey-SE
Source
J Occup Environ Hyg 2013 Jul; 10(7):384-396
NIOSHTIC No.
20042956
Abstract
The present study concerns the flow dynamics and associated contaminant transport in the near wake of a worker using an industrial-type benchtop enclosing hood. The primary focus is on evaluating the effects on the dynamics of the wake flow and the exposure level of various extraneous factors, such as the strength and direction of cross-drafts and the worker's body heat and shape. Three-dimensional Unsteady Reynolds-Averaged Navier-Stokes simulations were carried out for a model of a simple mannequin and a model of an anthropometric mannequin. Estimated flow patterns and concentrations near the simple mannequin were compared with the observations from concurrent smoke visualization experiments and with the experimental concentration measurements, respectively. Results for both visualizations indicated that the flow in front of the worker is dominated by dynamic vortical structures and that body heat may have negative effects on the exposure level, especially at low flow rates. Using simple rounded shapes to simulate the human form was a fair approximation from the viewpoint of flow structures and exposure trends, which agreed well with the experimental measurements and observations. However, the quantitative values of the predicted concentrations in the breathing zone were sensitive to the mesh resolution.
Keywords
Ventilation-hoods; Exhaust-hoods; Environmental-control-equipment; Environmental-exposure; Air-contamination; Air-flow; Particle-aerodynamics; Breathing-zone; Exposure-assessment; Measurement-equipment; Anthropometry; Body-temperature; Models; Simulation-methods; Quantitative-analysis; Transport-mechanisms; Exposure-levels; Visual-images; Author Keywords: contaminant transport; enclosing exhaust hoods; wake flow
Contact
Ertan Karaismail, Rensselaer Polytechnic Institute, Scientific Computation Research Center, 110 8th Street, Troy, NY 12180
CODEN
JOEHA2
Publication Date
20130701
Document Type
Journal Article
Email Address
karaie@rpi.edu
Funding Type
Grant
Fiscal Year
2013
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-008165; B20130805
Issue of Publication
8
ISSN
1545-9624
Source Name
Journal of Occupational and Environmental Hygiene
State
WV; NY
Performing Organization
West Virginia University
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