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Annals of Occupational Hygiene Advance Access originally published online on August 10, 2009
Annals of Occupational Hygiene 2009 53(7):739-748; doi:10.1093/annhyg/mep054
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© The Author 2009. Published by Oxford University Press on behalf of the British Occupational Hygiene Society

Experimental Characterization of a Plume of Passive Contaminant above a Thermal Source: Capture Efficiency of a Fume Extraction Hood

René Devienne1,*, Jean Raymond Fontaine2, Jérémie Kicka2 and Francis Bonthoux2

1 LEMTA, CNRS UMR 7563 2, Avenue de la Forêt de Haye, BP 160, 54504 Vandoeuvre-lès-Nancy Cedex, France
2 Institut National de la Recherche et de la Sécurité, Département Ingénierie des Procédés, Avenue de Bourgogne, BP 27, 54501 Vandoeuvre-lès-Nancy Cedex, France

* Author to whom correspondence should be addressed. Tel: +33-(0)3-83-59-56-00; fax: +33-(0)3-83-59-55-51; e-mail: rene.devienne{at}ensem.inpl-nancy.fr

Industrial ventilation problems can be linked to the formation of thermal plumes that develop due to natural convection above various heat sources. These plumes, independent of the energy losses and thermal constraints caused, can also be the carrier of polluting products. This article describes an experimental study of the dynamic, thermal, and mass fields that develop from a hot rectangular (0.5 x 1.25 m) horizontal source. The metrology available allows the measurement of not only the local temperatures and velocities but also the concentration of a tracer gas (helium). Mathematical models have been developed enabling representation of the fields concerned; their characterization by isothermal, iso-velocity, or iso-concentration curves; calculation of the flow rate carried by the plume at a given height; calculation of the enthalpy transport; and so on. Moreover, a pollutant capture device has been introduced, and the measurement technique used allows the determination of various efficiencies of practical interest. The ratio of capture flow to free plume flow at a particular height appears to correlate well with the mean efficiencies obtained for distinct source temperatures.

Keywords: contaminant • heat source • hood • plume

Received February 20, 2009; in final form June 30, 2009


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