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The Effect of Fuel Injection Equipment of Water-In-Diesel Emulsions on Micro-Explosion Behaviour

Author

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  • Mhadi A. Ismael

    (Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia)

  • Morgan R. Heikal

    (Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia
    School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, UK)

  • A. Rashid A. Aziz

    (Mechanical Engineering Department, Universiti Teknologi Petronas, Seri Iskandar 32610, Malaysia)

  • Cyril Crua

    (School of Computing Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, UK)

Abstract

The number and size distributions of the water dispersed phase have a significant effect on both the long-term stability of an emulsion, and the probability of micro-explosions inside an engine. The emulsions are subjected to intense pressure and shear flow in the fuel injection equipment resulting in changes in the number and size distributions of the dispersed phase. These changes, in turn, have significant effects on the micro-explosion behavior of the droplets. To our knowledge, these effects are not known and have not been reported previously. To uncover some of these effects we carried out a comprehensive experimental investigation on an emulsion spray of 10% water (by volume) in diesel at different injection pressures of 500, 1000 and 1500 bar. A measurement system consisting of a high-speed camera was used to visualize the droplets’ micro-explosions and a thermocouple measured the temperature. Our measurements indicated that the emulsion shear in the injector nozzle shifted the emulsion droplet size distribution towards the smaller end resulting in a delay in the onset of micro-explosion. This delay in the onset of the micro-explosion is thought to be due to the decrease in the dispersed water coalescence rate which, in turn, increases the stability of the emulsion. The results also show that this delay in the onset of micro-explosion, and the temperature required for its onset, increased with injection pressure.

Suggested Citation

  • Mhadi A. Ismael & Morgan R. Heikal & A. Rashid A. Aziz & Cyril Crua, 2018. "The Effect of Fuel Injection Equipment of Water-In-Diesel Emulsions on Micro-Explosion Behaviour," Energies, MDPI, vol. 11(7), pages 1-13, June.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1650-:d:154297
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    References listed on IDEAS

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    Cited by:

    1. 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).
    2. Jungmo Oh & Myeonghwan Im & Seungjin Oh & Changhee Lee, 2019. "Comparison of NOx and Smoke Characteristics of Water-in-Oil Emulsion and Marine Diesel Oil in 400-kW Marine Generator Engine," Energies, MDPI, vol. 12(2), pages 1-15, January.
    3. Mhadi A. Ismael & Morgan R. Heikal & A. Rashid A. Aziz & Cyril Crua & Mohmmed El-Adawy & Zuhaib Nissar & Masri B. Baharom & Ezrann Z. Zainal A. & Firmansyah, 2018. "Investigation of Puffing and Micro-Explosion of Water-in-Diesel Emulsion Spray Using Shadow Imaging," Energies, MDPI, vol. 11(9), pages 1-12, August.
    4. 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.
    5. Ismael, Mhadi A. & A. Aziz, A. Rashid & Mohammed, Salah E. & Zainal A, Ezrann Z. & Baharom, Masri B. & Hagos, Ftwi Yohaness, 2021. "Macroscopic and microscopic spray structure of water-in-diesel emulsions," Energy, Elsevier, vol. 223(C).

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