Effects of mechanical constraint and heat capacity on vapor explosions

Masahiro Furuya*, Takahiro Arai

*この研究の対応する著者

研究成果: Conference contribution

1 被引用数 (Scopus)

抄録

Small-scale experiments have been conducted to investigate the triggering mechanism of vapor explosions. In order to attain good repeatability and visibility, a smooth round water droplet was impinged onto a molten alloy surface. This configuration suppresses premixing events prior to triggering. The effect of the water droplet curvature was found to be negligibly small when the droplet diameter is larger than 4.5 mm. Vapor explosion conditions were identical for the molten tin pool depths ranging from 0.5 to 40 mm. The experimental results and the heat conduction analysis suggest that the length scale required for atomizing and fine mixing in the triggering event of the vapor explosion are sufficiently smaller than the molten tin pool depth of 0.5 mm. Six different kinds of materials were used as the pool liquid. The lower limit of the contact temperature in the vapor explosion region closely agrees with the spontaneous nucleation temperature of water. The upper limit of the initial molten alloy temperature decreases when an oxide layer forms on the surface causing an increase of the emissivity of thermal radiation that has a stabilizing effect on the vapor film. When an oxide layer formed on the surface, a water droplet was occasionally entrapped into a molten alloy dome, since the oxide layer prevents the droplet from evaporating coherently. The vapor explosion region obtained for the mirror surface is a conservative estimate, since that for the oxide surface fell into the internal region of mirror surface.

本文言語English
ホスト出版物のタイトルProceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007
ページ469-476
ページ数8
DOI
出版ステータスPublished - 2007
外部発表はい
イベント5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007 - Puebla, Mexico
継続期間: 2007 6 182007 6 20

出版物シリーズ

名前Proceedings of the 5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007

Conference

Conference5th International Conference on Nanochannels, Microchannels and Minichannels, ICNMM2007
国/地域Mexico
CityPuebla
Period07/6/1807/6/20

ASJC Scopus subject areas

  • 機械工学
  • 物理学および天文学(全般)

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