Simulation of airflow in one- and two-room enclosures containing a fire source

Stavrakakis, GM; Markatos, NC

dc.contributor.author	Stavrakakis, GM	en
dc.contributor.author	Markatos, NC	en
dc.date.accessioned	2014-03-01T01:31:54Z
dc.date.available	2014-03-01T01:31:54Z
dc.date.issued	2009	en
dc.identifier.issn	0017-9310	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/19972
dc.subject	Buoyant-turbulent flow	en
dc.subject	Compartment fires	en
dc.subject	Computational Fluid Dynamics	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Air	en
dc.subject.other	Buoyancy	en
dc.subject.other	Computational fluid dynamics	en
dc.subject.other	Disasters	en
dc.subject.other	Doors	en
dc.subject.other	Fires	en
dc.subject.other	Fluid dynamics	en
dc.subject.other	Methane	en
dc.subject.other	Turbulent flow	en
dc.subject.other	Accurate predictions	en
dc.subject.other	Bi-directional flows	en
dc.subject.other	Buoyancy effects	en
dc.subject.other	Buoyant-turbulent flow	en
dc.subject.other	Compartment fires	en
dc.subject.other	Complex geometries	en
dc.subject.other	Design factors	en
dc.subject.other	Empirical correlations	en
dc.subject.other	Experimental datum	en
dc.subject.other	Fire plumes	en
dc.subject.other	Heat sources	en
dc.subject.other	Mass flow rates	en
dc.subject.other	Simple geometries	en
dc.subject.other	Specific locations	en
dc.subject.other	Temperature variations	en
dc.subject.other	Upper layers	en
dc.subject.other	Volumetric heat sources	en
dc.subject.other	Turbulence models	en
dc.title	Simulation of airflow in one- and two-room enclosures containing a fire source	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.ijheatmasstransfer.2007.10.046	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.ijheatmasstransfer.2007.10.046	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	In this study, the airflow in a room that contains a heat source is simulated numerically. The flow is considered turbulent and buoyant. The results of the mathematical model are validated with available experimental data at specific locations in the domain. A simple geometry is adopted, consisting of a room with a door that plays the role of both inlet-outlet for the fluid (air). At the centre of the room a methane burner is placed to serve as a heat source. The problem is simulated using two turbulence models, the well-known standard k-epsilon model and the RNG k-epsilon. model, both modified to account for buoyancy effects on turbulence. The burner is considered as a volumetric heat source. It is concluded that the fire plume development as well as the distributions of velocity and temperature are reasonably well predicted. Following this conclusion, both models are also applied to a different, more complex geometry that consisted of two rooms communicating via a door, while the heat source was placed in the first room. Unfortunately, there are no experimental data to compare with for this case, but the results appear plausible. Finally, important design factors, such as mass flow rates and neutral-plane heights, are calculated utilizing the CFD results, and are compared with those obtained by well-known empirical correlations. It is concluded that the bi-directional flow existing through the burning-room vent is similarly predicted by both turbulence models; the RNG k-epsilon model leading to higher, and more accurate predictions of temperature variations within the hot upper layer, at least for the single-room case. (c) 2009 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	International Journal of Heat and Mass Transfer	en
dc.identifier.doi	10.1016/j.ijheatmasstransfer.2007.10.046	en
dc.identifier.isi	ISI:000265807200030	en
dc.identifier.volume	52	en
dc.identifier.issue	11-12	en
dc.identifier.spage	2690	en
dc.identifier.epage	2703	en