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Autoignition Behavior of an Ethanol-Methylcellulose Gel Droplet in a Hot Environment

Author

Listed:
  • Donggi Lee

    (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea)

  • Jonghan Won

    (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea)

  • Seung Wook Baek

    (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea)

  • Hyemin Kim

    (Department of Aeronautical & Mechanical Design Engineering, Korea National University of Transportation, Daehak-ro 50, Chungju City 27469, Korea)

Abstract

Autoignition of an ethanol-based gel droplet was experimentally investigated by adding 10 wt % of methylcellulose as gellant to liquid ethanol. Experimental studies of the ignition behavior of the gel droplet were found to be quite rare. The initial droplet diameter was 1.17 ± 0.23 mm. The gel droplet was suspended on a K-type thermocouple and its evaporation, ignition and combustion characteristics were evaluated and compared with pure ethanol at an ambient temperature of 600, 700, and 800 °C under atmospheric pressure conditions. The gel droplet exhibited swelling and vapor jetting phenomena. Before ignition, a linear decrease in droplet diameter followed by a sudden increase was repeatedly observed, which was caused by evaporation and swelling processes, respectively. Major droplet swelling was detected just before the onset of ignition at all temperatures. But no further swelling was detected after ignition. For the gel droplet, the ignition delay accounted for 93% of the droplet lifetime at 600 °C, and 88% at 700 °C, but only 31% at 800 °C. Its average burning rate was also evaluated for all temperatures. At 800 °C, the gellant layer no longer exerts any influence on the combustion of the gel droplet.

Suggested Citation

  • Donggi Lee & Jonghan Won & Seung Wook Baek & Hyemin Kim, 2018. "Autoignition Behavior of an Ethanol-Methylcellulose Gel Droplet in a Hot Environment," Energies, MDPI, vol. 11(8), pages 1-11, August.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:8:p:2168-:d:164537
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    References listed on IDEAS

    as
    1. Zejun Liu & Xiaoping Hu & Zhen He & Jianjun Wu, 2012. "Experimental Study on the Combustion and Microexplosion of Freely Falling Gelled Unsymmetrical Dimethylhydrazine (UDMH) Fuel Droplets," Energies, MDPI, vol. 5(8), pages 1-11, August.
    2. Zejun Liu & Jianjun Wu & He Zhen & Xiaoping Hu, 2013. "Numerical Simulation on Head-On Binary Collision of Gel Propellant Droplets," Energies, MDPI, vol. 6(1), pages 1-16, January.
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    Cited by:

    1. Jonghan Won & Seung Wook Baek & Hyemin Kim & Hookyung Lee, 2019. "The Viscosity and Combustion Characteristics of Single-Droplet Water-Diesel Emulsion," Energies, MDPI, vol. 12(10), pages 1-12, May.

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