Evolution of bubbles in decomposition and replacement process of methane hydrate ...

• Main Authors: Liu, Yinan, Zhao, Li, Deng, Shuai, Bai, Dongsheng
• Format: Text
• Language: unknown
• Published: Taylor & Francis 2017
• Subjects: Biophysics; Biochemistry; Physical Sciences not elsewhere classified; Pharmacology; Evolutionary Biology; FOS Biological sciences; Chemical Sciences not elsewhere classified; Ecology; Biological Sciences not elsewhere classified; Methane hydrate
• Online Access: https://dx.doi.org/10.6084/m9.figshare.5277208.v1; https://tandf.figshare.com/articles/journal_contribution/Evolution_of_bubbles_in_decomposition_and_replacement_process_of_methane_hydrate/5277208/1

Nanobubbles have been proved to play an important role for the extraction kinetics of CH 4 hydrates. Existing investigations on nanobubbles mainly focus on the hydrate melting. However, the mechanism and effect of bubble evolution during the replacement of CH 4 hydrates by CO 2 are still elusive. Therefore, molecular dynamics simulations on melting and replacement of CH 4 hydrate are performed with the same initial system size, pressure and amount of CH 4 hydrates. It is proved the two processes move layer by layer but with different features. Moreover, despite the different composition of gas phases, behaviours of nanobubbles are similar during the two processes except that the gas film is not formed during the replacement. In addition, a quantitative analysis of molecules in each nanobubble during the decomposition is conducted preliminarily. Also a remarkable effect of mixed nanobubble on the replacement is revealed based on the analysis of bubble behaviour. It is found that CH 4 molecules are surrounded ...