Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Modeling a worker's exposure from a hand-held source in a uniform freestream.

Authors
Kim-T; Flynn-MR
Source
Am Ind Hyg Assoc J 1991 Nov; 52(11):458-463
NIOSHTIC No.
00204998
Abstract
A simple conceptual model was developed to test assumptions concerning the proper design of local exhaust ventilation systems intended to control the concentration of toxic airborne contaminants in a worker's breathing zone. This current study revised the earlier model based on experimental results. This revised model was validated using a tracer gas method in a wind tunnel. Results suggest the growing importance of turbulent diffusion and enhanced mass transport with increasing Reynolds number. The inverse proportionality of the breathing zone concentration to the freestream velocity and the dimensions of a worker suggest that the exposure for a bigger person may be lower than that for a smaller person. Increasing the freestream velocity will not always be a cost effective measure to control worker exposure. The authors caution that care needs be taken when extrapolating the results to real life situations as the stationary mannequin, the passive contaminant source, and the uniform freestream used in this study are not representative of many industrial situations.
Keywords
NIOSH-Publication; NIOSH-Grant; Control-technology; Occupational-exposure; Mathematical-models; Exhaust-ventilation; Air-flow; Air-contamination; Ventilation-systems; Toxic-gases
Contact
Environmental Sciences & Engr University of North Carolina Rosenau Hall 201H Chapel Hill, NC 27514
CODEN
AIHAAP
Publication Date
19911101
Document Type
Journal Article
Funding Amount
113206
Funding Type
Grant
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02392
Issue of Publication
11
ISSN
0002-8894
Priority Area
Control-technology
Source Name
American Industrial Hygiene Association Journal
State
NC
Performing Organization
University of North Carolina Chapel Hill, Chapel Hill, North Carolina
TOP