Experimental investigation of flame spreading over pure methane hydrate in a laminar boundary layer

Yoshihiro Maruyama, Masaru Joe Fuse, Takeshi Yokomori, Ryo Ohmura, Shigeru Watanabe, Toru Iwasaki, Wataru Iwabuchi, Toshihisa Ueda

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Flame spreading over pure methane hydrate in a laminar boundary layer is investigated experimentally. The free stream velocity (U) was set constant at 0.4 m/s and the surface temperature of the hydrate at the ignition (Ts) was varied between -10 and -80°C. Hydrate particle sizes were smaller than 0.5 mm. Two types of flame spreading were observed; "low speed flame spreading" and "high speed flame spreading". The low speed flame spreading was observed at low temperature conditions (Ts = -80 to -60°C) and temperatures in which anomalous self-preservation took place (Ts = -30 to -10°C). In this case, the heat transfer from the leading flame edge to the hydrate surface plays a key role for flame spreading. The high speed flame spreading was observed when Ts = -50 and -40°C. At these temperatures, the dissociation of hydrate took place and the methane gas was released from the hydrate to form a thin mixed layer of methane and air with a high concentration gradient over the hydrate. The leading flame edge spread in this premixed gas at a spread speed much higher than laminar burning velocity, mainly due to the effect of burnt gas expansion.

Original languageEnglish
Pages (from-to)2131-2138
Number of pages8
JournalProceedings of the Combustion Institute
Volume34
Issue number2
DOIs
Publication statusPublished - 2013

Fingerprint

laminar boundary layer
Laminar boundary layer
Methane
Hydrates
hydrates
flames
methane
Gases
high speed
low speed
Temperature
gas expansion
Ignition
free flow
gases
Particle size
ignition
surface temperature
Heat transfer
heat transfer

Keywords

  • Flame spreading
  • Laminar boundary layer
  • Methane hydrate

ASJC Scopus subject areas

  • Mechanical Engineering
  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry

Cite this

Experimental investigation of flame spreading over pure methane hydrate in a laminar boundary layer. / Maruyama, Yoshihiro; Fuse, Masaru Joe; Yokomori, Takeshi; Ohmura, Ryo; Watanabe, Shigeru; Iwasaki, Toru; Iwabuchi, Wataru; Ueda, Toshihisa.

In: Proceedings of the Combustion Institute, Vol. 34, No. 2, 2013, p. 2131-2138.

Research output: Contribution to journalArticle

Maruyama, Yoshihiro ; Fuse, Masaru Joe ; Yokomori, Takeshi ; Ohmura, Ryo ; Watanabe, Shigeru ; Iwasaki, Toru ; Iwabuchi, Wataru ; Ueda, Toshihisa. / Experimental investigation of flame spreading over pure methane hydrate in a laminar boundary layer. In: Proceedings of the Combustion Institute. 2013 ; Vol. 34, No. 2. pp. 2131-2138.
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