No data available.
Please log in to see this content.
You have no subscription access to this content.
No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.
Formation of methane nano-bubbles during hydrate decomposition and their effect on hydrate growth
3.E. D. Sloan and C. A. Koh, Clathrate Hydrates of Natural Gases, 3rd ed. (CRC Press, Boca Raton, FL, 2008).
25.J. Ripmeester, S. Hosseini, P. Englezos, and S. Alavi, in Canadian Unconventional Resources and International Petroleum Conference, (2010).
53.S.-T. Lou, Z.-Q. Ouyang, Y. Zhang, X.-J. Li, J. Hu, M.-Q. Li, and F.-J. Yang, J. Vac. Sci. Technol., B: Microelectron. Nanometer Struct. 18, 2573 (2000).
54.F. Y. Ushikubo, T. Furukawa, R. Nakagawa, M. Enari, Y. Makino, Y. Kawagoe, T. Shiina, and S. Oshita, Colloids Surf., A 361, 31 (2010).
See supplementary material at http://dx.doi.org/10.1063/1.4920971
for a description of the simulation protocol, a plot of the variation of the potential energy with time during the equilibration period of the simulation, a zoom in of the potential energy as a function of time for the simulation showing the step-like dissociation of the hydrate, snapshots of the hydrate decomposition, changes in the average radius of a nanobubble with time and the migration of the nanobubble in the simulation, a snapshot of the growth of the hydrate plane adjacent to a nanobubble, and variation of the F3
parameter on the two sides of the hydrate phase (adjacent to a nanobubble and with no nanobubble) at two temperatures.[Supplementary Material]
Article metrics loading...
Molecular 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.
Full text loading...
Most read this month