Open AccessEffect of pressure on the heat transfer of pool fire in a closed chamber
Author(s) -
Jian Chen,
Yubo Bi,
Yanli Zhao,
Wai Cheong Tam,
Changhai Li,
Shouxiang Lu
Publication year - 2020
Publication title -
journal of thermal analysis and calorimetry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.521
H-Index - 92
eISSN - 1588-2926
pISSN - 1388-6150
DOI - 10.1007/s10973-020-09540-y
Subject(s) - emissivity , mechanics , heat flux , radiation , mass transfer , heat transfer , chamber pressure , thermodynamics , atmospheric pressure , flux (metallurgy) , chemistry , radiation flux , thermal radiation , materials science , mass flux , analytical chemistry (journal) , optics , meteorology , physics , chromatography , organic chemistry
A combined experimental and analytical study was performed to determine the effect of pressure on the heat transfer of pool fire in a closed chamber. A series of ethanol pool fires with nominal diameters from 4 cm to 10 cm were conducted for a wide range of pressure conditions in between ~ 60 kPa to 250 kPa. Considering the effect of pressure, a theoretical formulation was proposed to estimate the radiation flux received by the pool surface from the chamber wall and hot gases. The relationship between the modified mass burning flux of pool fire and pressure was obtained. It was found that external radiation heat transfer received by pool surface depends significantly on gas temperature and its radiative properties and wall temperature. Results showed that these parameters are highly coupled in determining the effect of pressure to the external radiation. Furthermore, the average mass burning flux modified by the obtained external radiation was fitted with pressure by a power function and the fitted exponent value was consistent with theoretical analysis.