Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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Experimental Studies of the Explosion Characteristics by Varying Concentrations of a Multi Layered Water Gel Barrier

다층구조 Water Gel Barrier의 농도변화에 따른 폭발특성에 대한 실험적 연구

  • Ha, Dae Il (Dept. of Safety Engineering, Graduate School of Industry, Seoul National University of Science and Technology) ;
  • Park, Dal Jae (Dept. of Safety Engineering, Seoul National University of Science and Technology)
  • 하대일 (서울과학기술대학교 산업대학원 안전공학과) ;
  • 박달재 (서울과학기술대학교 안전공학과)
  • Received : 2018.10.08
  • Accepted : 2019.01.17
  • Published : 2019.02.28
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Abstract

Experimental studies have been carried out to investigate characteristics of gas explosion using a multi layered water gel barrier in a vented explosion chamber. The chamber is consisted of 1600 mm in length, with a square cross-section of $100{\times}100mm^2$. The gel concentration of inner layer of MLWGB ranged from 10% to 90% with intervals of 10% by weight of gel. Displacement of the MLWGB was photographed with a measured using a high-speed video camera, and pressure development was measured using a data acquisition system. It was found that MLWGBs with 10 ~ 20% inner layer concentrations were ruptured during the explosions. As the concentrations of inner layer increased from 30% to 90%, the barriers were not ruptured. As the gel concentrations of the inner layer increased, the displacement increased toward the chamber exit and the pressure decreased for the ruptured barriers. It was found that the pressure attenuation obtained from the MLWGB was higher than that of the single water gel barrier. For the cases of non-ruptured barriers, the pressure inside the chamber less increased with increasing gel concentrations of the inner layer. It was also found that the displacement moved back into the chamber for non-ruptured MLWGBs, and it was sensitive to the gel concentrations.

Keywords

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Fig. 1. Schematic diagram.

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Fig. 2. Left) Gel displacement images. Right) Pressure/gel displacement versus time for O100I20.

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Fig. 3. Left) Gel displacement images. Right) Pressure/gel displacement versus time for O100I90.

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Fig. 4. Gel displacements for cases of O100I10 and O100I20.

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Fig. 5. Gel displacements for cases from O100I30 to O100I90.

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Fig. 6. Comparison of Pressure time histories of both MLWGB and SLWGB : (a) O100I20 and (b) T20C20.

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Fig. 7. Pressure-time histories for cases from O100I30 to O100I90.

Table 1. Thickness and concentrations of MLWGB and SLWGB used in the tests

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References

  1. S. H. Chae, S. I Jung and Y. S. Lee, "A Experimental Study on the Characteristics of Gas Explosion due to Vent Shape and Size", J. Korean Soc. Saf., Vol. 21, No. 3 , pp. 38-44, 2006.
  2. N. S. Kim and D. J. Park, "Experimental Investigations on Explosion Characteristics of LPG/Air Mixture by Electrostatic Discharge Energies", J. Korean Soc. Saf., Vol. 26, No. 6 , pp. 26-30, 2011. https://doi.org/10.14346/JKOSOS.2011.26.6.026
  3. A. Pekalski, J. Zevenbergen, S. Lemkowitz and H. Pasman, "A Review of Explosion Prevention and Protection Systems Suitable as Ultimate Layer of Protection in Chemical Process Installations", Process Safety and Environmental Protection, 83(B1), pp. 1-17, 2005. https://doi.org/10.1205/psep.04023
  4. N. I. Kim and D. J. Park, "Experimental investigations of the Deflagration Pressure Attenuation using a Water Gel Barrier in a Vented Explosion Chamber", Science Technology of Energetic Materials, Vol. 77, No. 6 , pp. 148-152, 2016.
  5. D. J. Park and N. I. Kim, "Experimental Investigations on the Characteristics of Explosion Mitigations by Different Concentrations of Agar Gel Barriers", KIGAS, Vol. 15, No. 5 , pp. 13-18, 2011.
  6. T. Homae, K. Wakabayashi, T. Matsumura and Y. Nakayama, "Attenuation of Blast Wave using Water Gel", Science and Technology of Energetic Materials, Vol. 67, pp. 182-186, 2006.
  7. T. Homae, K. Wakabayashi, T. Matsumura and Y. Nakayama, "Attenuation of Blast Wave using Sand around a Spherical Pentolite", Science and Technology of Energetic Materials, 68, 90-93, 2007.
  8. T. Homae, K. Wakabayashi, T. Matsumura and Y. Nakayama, "Dependence of Blast Attenuation on Weight of Barrier Materials", Materials Science Forum, Vol. 566, pp.179-184, 2007. https://doi.org/10.4028/www.scientific.net/MSF.566.179