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Title: Nonequilibrium Thermodynamics of Hydrate Growth on a Gas-Liquid Interface

Journal Article · · Physical Review Letters
 [1];  [2];  [1]
  1. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  2. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); Technical Univ. of Madrid, Madrid (Spain)

We develop a continuum-scale phase-field model to study gas-liquid-hydrate systems far from thermodynamic equilibrium. We design a Gibbs free energy functional for methane-water mixtures that recovers the isobaric temperature-composition phase diagram under thermodynamic equilibrium conditions. The proposed free energy is incorporated into a phase-field model to study the dynamics of hydrate formation on a gas-liquid interface. We elucidate the role of initial aqueous concentration in determining the direction of hydrate growth at the interface, in agreement with experimental observations. Our model also reveals two stages of hydrate growth at an interface—controlled by a crossover in how methane is supplied from the gas and liquid phases—which could explain the persistence of gas conduits in hydratebearing sediments and other nonequilibrium phenomena commonly observed in natural methane hydrate systems.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FE0013999; SC0018357; FE0013999 and DE-SC0018357
OSTI ID:
1505593
Alternate ID(s):
OSTI ID: 1430772
Journal Information:
Physical Review Letters, Vol. 120, Issue 14; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (8)

Experimental Investigation of Gas Flow and Hydrate Formation Within the Hydrate Stability Zone journal July 2018
Effect of Gas Flow Rate on Hydrate Formation Within the Hydrate Stability Zone journal August 2018
Mechanisms of Methane Hydrate Formation in Geological Systems journal October 2019
Xenon Hydrate as an Analog of Methane Hydrate in Geologic Systems Out of Thermodynamic Equilibrium journal May 2019
Methane Hydrate Film Thickening in Porous Media journal October 2019
Introduction to Special Issue on Gas Hydrate in Porous Media: Linking Laboratory and Field‐Scale Phenomena journal August 2019
Molecular-scale thermally activated fractures in methane hydrates: a molecular dynamics study journal January 2019
Flow and mixing dynamics of phase-transforming multicomponent fluids journal September 2019

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