Combustion behavior and oscillatory regime of flame spread over ethanol aqueous solution with different proportions

•The reciprocal flashpoint is directly proportional to the molar ratio of ethanol.•Three regimes are observed with distinct proportions of ethanol.•The flame cannot progress as the proportion of ethanol is smaller than 25%. The ethanol aqueous solution possesses an extensive application in energy an...

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Bibliographic Details
Published in:Fuel (Guildford) 2019-10, Vol.253, p.220-228
Main Authors: Li, Manhou, Shu, Zhizhong, Yi, Longfei, Chen, Bing, Zhao, Yiran, Geng, Shuwei
Format: Article
Language:English
Subjects:
Aqueous solutions
Chemical industry
Combustion
Computer simulation
Energy
Ethanol
Ethanol aqueous solution
Flame spread
Flammability
Flashpoint prediction model
Organic chemistry
Oscillatory regime
Prediction models
Proportioning (mixing)
Raoults law
Scaling
Storm seepage
Thermal exchange energy
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Summary:•The reciprocal flashpoint is directly proportional to the molar ratio of ethanol.•Three regimes are observed with distinct proportions of ethanol.•The flame cannot progress as the proportion of ethanol is smaller than 25%. The ethanol aqueous solution possesses an extensive application in energy and chemical industry, however, it easily catches fire owing to its high-volatile and flammable property. In current research, the combustion behavior and oscillatory regime of flame spread over ethanol aqueous solutions with different proportions are investigated and characterized. The measured velocity and the size of subsurface flow prove that the amount of thermal exchange energy is enhanced by the addition of water in the solution. Moreover, a flashpoint prediction model is developed based upon the equation of Clausius-Clapeyron, the Raoult’s law and the ideal solution theory. The scaling analysis identifies that the reciprocal flashpoint is directly proportional to the molar ratio of ethanol. Furthermore, three oscillatory regimes are observed with different proportions of ethanol: the “continuous advancement” regime, the “forward-reverse-forward” regime and the “forward-stagnation-forward” regime. Thus, the proportioning ethanol aqueous solutions can be used to simulate the flame spread behaviors of various flammable liquids. This finding possesses a potential significant guiding on the rapid analysis of the scene of oil spilling accident.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2019.05.018