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Jet Entrainment Effect in Buoyant Jet and Iso-Thermal Fire Modeling  

Lee, Eui-Ju (부경대학교 안전공학부)
Publication Information
Fire Science and Engineering / v.23, no.6, 2009 , pp. 111-115 More about this Journal
Abstract
Acetone LIF and Rayleigh scattering measurements were performed to identify the entrainment of ambient air in the buoyant jet qualitatively. The air entrainment near nozzle exit was enhanced with increasing both an axial distance and Reynolds number. The results supported that the air entrainment had to be considered in isothermal model for the development of its accuracy. Also, this paper provided an isothermal model based on the ideal plume, of which radiative heat loss fraction was assumed to 0.35 and the entainment of isothermal jet was considered. This simple model could be used in compartment or semi-enclosure fires such as tunnel, and it is more reliable because of introducing entrainment effect in isothermal jet.
Keywords
Acetone LIF (laser-induced fluorescence); Rayleigh scattering; Isothermal fire model;
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