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      • Boundary conditions and experimental observation of micro-explosion for water-ethanol diesel emulsified fuel droplets

        ( Xiaoqing Zhang ),( Tie Li ),( Jianpeng Song ),( Bin Wang ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-

        Droplet micro-explosion is a severe crushing phenomenon of emulsified fuel droplets during heating and evaporation. It is caused by overheating and vaporization of light components as the temperature rising to the extreme heat. Currently there are mainly two methods for solving the limit of superheat: Avedisian-Glassman kernel method and the intermolecular potential model. For the former, the nucleation rate obtained by this method is much smaller than the experimental observation, and also the surface tension for the activation energy of the molecule is not suitable for micro-size. While for the latter, it can only apply to pure liquid. Based on the Avedisian-Glassman kernel method and the intermolecular potential model, a solution for the three-component droplet micro-explosion limit of aqueous ethanol diesel emulsified fuels. Considering that the water and ethanol between the main bond energy is larger than other potential hydrogen bonding by one to two orders of magnitude, recombining the number density of molecules and the structure of molecular clusters, the hydrogen bond saturation is revised, further the activation energy of molecules can be calculated, the temperature boundary conditions for micro-explosion of water-ethanol diesel emulsified fuel droplets are obtained last. This method is not only applicable for pure liquids such as water and alcohols, but also for fuels with small liquid molecules and intermolecular potential energy with hydrogen bonds. The result of the superheat limit temperature of water under atmospheric pressure by using this method is consistent with the value of present literatures well. For more, the micro-explosion temperature boundary conditions for a kind of aqueous ethanol diesel emulsified fuel(HE30) droplet is calculated by using this method, and an observation experiment for micro-explosion is conducted to verify calculation results at last.

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