NDLI: Numerical and Experimental Investigations on Hood Capture and Protection Efficiencies

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Karaismail, Ertan Celik, Ismail Steven, E. Guffey William, H. Dodrill
Copyright Year	2008
Abstract	Effective hoods are critical for the protection of workers from airborne contaminants. The aim of this study is to determine the effects of cross-draft and presence of a worker on the effectiveness of the bench-top enclosing hoods, which, unlike laboratory fume hoods have no sash and have a constant cross-sectional area. The computational fluid dynamics (CFD) software, FLUENT, with shear-stress transport (SST) k-ω turbulence model was used to investigate the effect of orientation of the manikin and hood with respect to cross-draft on the flow and contaminant concentration field. Experiments were conducted using a manikin and a fume hood in a wind tunnel and the flow around the manikin and inside the hood was investigated via particle image velocimetry (PIV) measurements. The correlation of contaminant leakage with the turbulent intensity and recirculating vortices at the hood face were observed. The hood and manikin orientation was found to change the exposure level significantly. Maximum contaminant leakage from the hood to the working environment has been found when the hood and manikin were placed 30 degrees to the cross draft. Maximum containment was observed when the manikin and hood were oriented in the same direction as the cross draft and perpendicular to the cross draft.
Sponsorship	Fluids Engineering Division
Starting Page	1007
Ending Page	1016
Page Count	10
File Format	PDF
ISBN	9780791848401
DOI	10.1115/FEDSM2008-55277
e-ISBN	0791838323
Volume Number	Volume 1: Symposia, Parts A and B
Conference Proceedings	ASME 2008 Fluids Engineering Division Summer Meeting collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences
Language	English
Publisher Date	2008-08-10
Publisher Place	Jacksonville, Florida, USA
Access Restriction	Subscribed
Subject Keyword	Leakage Turbulence Computational fluid dynamics Wind tunnels Computer software Particulate matter Vortices Shear stress Flow (dynamics) Containment
Content Type	Text
Resource Type	Article

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