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Mechanism of micro-explosion of water-in-oil emulsified fuel droplet and its effect on soot generation

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  • Shen, Shiquan
  • Sun, Kai
  • Che, Zhizhao
  • Wang, Tianyou
  • Jia, Ming
  • Cai, Junqian

Abstract

In this study, the mechanism of micro-explosion of single droplets of water-in-oil (W/O) emulsified fuels and its effect on the soot generation are investigated experimentally using suspended droplets. Two distinct breakup modes are observed as the droplets are heated, namely catastrophic micro-explosion after water coalescence at a lower surfactant concentration and puffing at a higher surfactant concentration without water coalescence. To understand the underlying physics of such transition, the water/oil interfacial tension is investigated. It is found that the increase of water/oil interfacial tension after the deactivation of surfactant can significantly accelerate the coalescence of dispersed water, and effectively increase the temperature of bubble nucleation. The deactivation of surfactant is a prerequisite for the occurrence of catastrophic micro-explosion. The reason is found to be that the catastrophic micro-explosion can be induced by the explosive vaporization of water only if the dispersed water coalesces rapidly into large droplets to explode violently at a high superheat degree. The surfactant concentration in emulsified fuels influences the deactivation temperature of surfactant. Therefore, the catastrophic micro-explosion can be controlled to occur by adjusting the surfactant concentration in emulsified fuels. In addition, it is also found that the micro-explosion of W/O emulsified fuel during the combustion can effectively decrease the soot generation due to uniform fuel/air mixture formed after the micro-explosion.

Suggested Citation

  • Shen, Shiquan & Sun, Kai & Che, Zhizhao & Wang, Tianyou & Jia, Ming & Cai, Junqian, 2020. "Mechanism of micro-explosion of water-in-oil emulsified fuel droplet and its effect on soot generation," Energy, Elsevier, vol. 191(C).
    • Handle: RePEc:eee:energy:v:191:y:2020:i:c:s0360544219321838
    DOI: 10.1016/j.energy.2019.116488
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    4. Kumar, Atul & Chen, Hsien-Wen & Yang, Shouyin, 2023. "Modeling microexplosion mechanism in droplet combustion: Puffing and droplet breakup," Energy, Elsevier, vol. 266(C).
    5. Dmitrii V. Antonov & Roman M. Fedorenko & Leonid S. Yanovskiy & Pavel A. Strizhak, 2023. "Physical and Mathematical Models of Micro-Explosions: Achievements and Directions of Improvement," Energies, MDPI, vol. 16(16), pages 1-16, August.
    6. Rosli, Mohd A.F. & Aziz, A. Rashid A. & Ismael, Mhadi A. & Elbashir, Nimir O. & Zainal A., Ezrann Z. & Baharom, Masri & Mohammed, Salah E., 2021. "Experimental study of micro-explosion and puffing of gas-to-liquid (GTL) fuel blends by suspended droplet method," Energy, Elsevier, vol. 218(C).
    7. Mohd Fadzli Hamid & Yew Heng Teoh & Mohamad Yusof Idroas & Mazlan Mohamed & Shukriwani Sa’ad & Sharzali Che Mat & Muhammad Khalil Abdullah & Thanh Danh Le & Heoy Geok How & Huu Tho Nguyen, 2022. "A Review of the Emulsification Method for Alternative Fuels Used in Diesel Engines," Energies, MDPI, vol. 15(24), pages 1-26, December.
    8. Zhou, Feng & Wang, Jigang & Zhou, Xincong & Qiao, Xinqi & Wen, Xiaofei, 2021. "Effect of 2, 5-dimethylfuran concentration on micro-explosive combustion characteristics of biodiesel droplet," Energy, Elsevier, vol. 224(C).
    9. Dmitrii V. Antonov & Roman M. Fedorenko & Pavel A. Strizhak, 2022. "Micro-Explosion Phenomenon: Conditions and Benefits," Energies, MDPI, vol. 15(20), pages 1-19, October.
    10. Chen, Zhenbin & Wang, Li & Wei, Zhilong & Wang, Yu & Deng, Jiaojun, 2022. "Effect of components on the emulsification characteristic of glucose solution emulsified heavy fuel oil," Energy, Elsevier, vol. 244(PB).
    11. Klimenko, A. & Shlegel, N.E. & Strizhak, P.A., 2023. "Breakup of colliding droplets and particles produced by heavy fuel oil pyrolysis," Energy, Elsevier, vol. 283(C).

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