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Fundamental Investigation of Exhaust Hoods.

Authors
Esmen-NA; Weyel-DA; Grauel-TA; Ilori-AG; Jossell-S; Parris-A
Source
Department of Industrial Environmental Health Sciences, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania 1990 Aug:114 pages
Link
NIOSHTIC No.
00197333
Abstract
This study investigated the theoretical aspects of airflow in front of freely suspended flanged hoods with arbitrarily, but symmetrically shaped hood orifices. Results indicated that an extension of the superimposition of two virtual sinks and potential flow assumption to describe the flow field can be used. The observed effect of turbulence on the capture efficiency of hoods and the magnitude of the reduction of the capture efficiency with what might be considered to be a relatively mild turbulent cross draft. Experimental data indicated that a turbulent cross draft in the order of 5 to 10% of the hood induced air speed in the mean velocity magnitude can reduced the overall capture efficiency of a hood by 15%. Using a conformal mapping technique, the theoretical investigations were also extended to include hoods with adjacent planes of arbitrary orientation. Optimization techniques which consider the hood geometry were investigated. The identified technique can be used to select hood orifice shape and dimensions not only to achieve proper control but also improve the mechanical efficiency of the process.
Keywords
NIOSH-Grant; Control-technology; Exhaust-hoods; Air-flow; Ventilation-equipment; Ventilation-systems;
Contact
Industrial Environ Health Scis University of Pittsburgh 130 Desoto Street Pittsburgh, PA 15261
Publication Date
19900801
Document Type
Final Grant Report;
Funding Amount
339963.00
Funding Type
Grant;
Fiscal Year
1990
NTIS Accession No.
PB91-173393
NTIS Price
A07
Identifying No.
Grant-Number-R01-OH-02132
NIOSH Division
OEP
Priority Area
Control Technology and Personal Protective Equipment; Research Tools and Approaches; Control-technology;
Source Name
Department of Industrial Environmental Health Sciences, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania
State
PA;
Performing Organization
University of Pittsburgh at Pittsburgh, Pittsburgh, Pennsylvania
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