Formation of methane nano-bubbles during hydrate decomposition and their effect on hydrate growth

Download
  1. Get@NRC: Formation of methane nano-bubbles during hydrate decomposition and their effect on hydrate growth (Opens in a new window)
DOIResolve DOI: http://doi.org/10.1063/1.4920971
AuthorSearch for: ; Search for: ; Search for: ; Search for:
TypeArticle
Journal titleJournal of Chemical Physics
ISSN0021-9606
Volume142
Issue21
Article number214701
SubjectBubble formation; Dissociation; Hydration; Liquids; Methane; Molecular dynamics; Molecules; Dissolved methane; Hydrate decomposition; Hydrate dissociation; Methane hydrate dissociation; Methane hydrates; Methane molecules; Presence of water; Spherical bubbles; Gas hydrates
AbstractMolecular dynamic simulations are performed to study the conditions for methane nano-bubble formation during methane hydrate dissociation in the presence of water and a methane gas reservoir. Hydrate dissociation leads to the quick release of methane into the liquid phase which can cause methane supersaturation. If the diffusion of methane molecules out of the liquid phase is not fast enough, the methane molecules agglomerate and form bubbles. Under the conditions of our simulations, the methane-rich quasi-spherical bubbles grow to become cylindrical with a radius of ∼11 Å. The nano-bubbles remain stable for about 35 ns until they are gradually and homogeneously dispersed in the liquid phase and finally enter the gas phase reservoirs initially set up in the simulation box. We determined that the minimum mole fraction for the dissolved methane in water to form nano-bubbles is 0.044, corresponding to about 30% of hydrate phase composition (0.148). The importance of nano-bubble formation to the mechanism of methane hydrate formation, growth, and dissociation is discussed.
Publication date
PublisherAIP Publishing
LanguageEnglish
AffiliationNational Research Council Canada; Security and Disruptive Technologies
Peer reviewedYes
NPARC number21275837
Export citationExport as RIS
Report a correctionReport a correction
Record identifier27e5680f-5bb3-4295-aed0-1577c7b6eafb
Record created2015-07-14
Record modified2017-03-23
Bookmark and share
  • Share this page with Facebook (Opens in a new window)
  • Share this page with Twitter (Opens in a new window)
  • Share this page with Google+ (Opens in a new window)
  • Share this page with Delicious (Opens in a new window)