Clathrate hydrate crystal growth in liquid water saturated with a hydrate-forming substance: Variations in crystal morphology

Ryo Ohmura, Wataru Shimada, Tsutomu Uchida, Yasuhiko H. Mori, Satoshi Takeya, Jiro Nagao, Hideki Minagawa, Takao Ebinuma, Hideo Narita

研究成果: Article査読

67 被引用数 (Scopus)

抄録

This paper reports on our interpretation of our visual observations of the variations in macroscopic morphology of hydrate crystals growing in liquid water saturated with a guest substance prior to the hydrate formation. The observations were made in a high-pressure cell charged with liquid water and gaseous CO2. They revealed distinct variations in the morphology of hydrate crystals depending on the system subcooling δTsub, the temperature deficiency inside the cell from the triple CO 2-hydrate-water equilibrium temperature under a given pressure. When δTsub ≲ 3K, a hydrate film first grew along the CO 2-water interface; then hydrate crystals with dendritic morphology grew in large numbers into the liquid-water phase from that hydrate film. When δTsub ≲ 2K, the dendritic crystals were replaced by skeletal or polyhedral crystals. We present a non-dimensional index for such variations in hydrate crystal morphology. This is based on the idea that this morphology depends on the growth rate of hydrate crystals, and their growth rate is controlled by the mass transfer of the hydrate-guest substance (CO 2 in the present experiments), dissolved in the bulk of liquid water, to the hydrate crystal surfaces. The morphology variations observed in the present and previous studies are related to this index.

本文言語English
ページ(範囲)1-16
ページ数16
ジャーナルPhilosophical Magazine
84
1
DOI
出版ステータスPublished - 2004 1月 1
外部発表はい

ASJC Scopus subject areas

  • 凝縮系物理学

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