Journal
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
Volume 143, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2019.118592
Keywords
Amorphous ice; Metastable state; Condensation; Crystallization; Methane; Gas hydrate
Categories
Funding
- Russian Foundation for Basic Research [18-08-00352a, 18-38-00443 mol-a]
- Program for Basic Research of the Ural Branch of the RAS [18-2-2-3]
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The conditions of the emergence of self-sustaining (explosive) crystallization in amorphous substances under intense non-steady state nucleation that occur during the formation of gas hydrates in low-temperature water-gas condensates prepared by a condensation method have been analyzed. The possibility of a spontaneous occurrence of hot crystallization centers in places of random accumulation of fluctuation-induced nuclei capable of causing local heating and transition to the explosive mode of crystallization in a non-equilibrium amorphous medium has been discussed. The stability of methane saturated amorphous ice layers with crystallization centers introduced artificially has been experimentally investigated. The presence of crystal nuclei in non-equilibrium gas-saturated amorphous condensates shifted the beginning of crystallization to the region of low temperatures. Crystallization took place in several stages. The behavior of DTA thermograms pointed to its development from different hot centers. In conditions of deep metastability, a spontaneous crystallization mode is realized, which ensures the capture of gas molecules and the formation of a gas hydrate. (C) 2019 Elsevier Ltd. All rights reserved.
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