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Formation of nanobubbles generated by hydrate decomposition: A molecular dynamics study |
| Zilin Wang(王梓霖)1,2, Liang Yang(杨亮)1,2,†, Changsheng Liu(刘长生)1,2, and Shiwei Lin(林仕伟)1,2,‡ |
1 State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China;
2 School of Materials Science and Engineering, Hainan University, Haikou 570228, China |
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Abstract Natural gas hydrate is estimated to have huge reserves. Its exploitation can solve the global oil and gas shortage problem. Hydrates decompose into water and methane, and methane molecules are supersaturated to form nanobubbles. Methane nanobubbles can affect the decomposition efficiency of hydrates. They can provide abundant methane sources for the re-nucleation of hydrates. Molecular dynamics is employed in this study to investigate the decomposition process of type I methane hydrate and the formation of methane nanobubbles generated during decomposition under different methane mole fraction, pressures, and temperatures. The results indicate that external pressure inhibits the diffusion of methane molecules, thereby preventing the formation of nanobubbles. A higher mole fraction of methane molecules in the system requires a higher external pressure to generate stable nanobubbles after the decomposition of the hydrate structure. At 330 K, it is easy to form a nanobubble structure. Results of this study can help provide ideas for the study of efficient extraction and secondary nucleation of hydrates.
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Received: 07 April 2022
Revised: 14 June 2022
Accepted manuscript online: 14 June 2022
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PACS:
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31.15.xv
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(Molecular dynamics and other numerical methods)
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91.50.Hc
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(Gas and hydrate systems)
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47.55.dd
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(Bubble dynamics)
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36.40.Qv
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(Stability and fragmentation of clusters)
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| Fund: Project supported by the specific research fund of the Innovation Platform for Academicians of Hainan Province of China and the Hainan Provincial Natural Science Foundation of China (Grant No. 519MS025). |
Corresponding Authors:
Liang Yang, Shiwei Lin
E-mail: yl5923@hainanu.edu.cn;linsw@hainanu.edu.cn
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Cite this article:
Zilin Wang(王梓霖), Liang Yang(杨亮), Changsheng Liu(刘长生), and Shiwei Lin(林仕伟) Formation of nanobubbles generated by hydrate decomposition: A molecular dynamics study 2023 Chin. Phys. B 32 023101
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