Hydrate film growth on the surface of a gas bubble suspended in water

被引:120
作者
Peng, B. Z.
Dandekar, A.
Suin, C. Y.
Luo, H.
Ma, Q. L.
Pang, W. X.
Chen, G. J. [1 ]
机构
[1] China Univ Petr, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China
[2] Univ Alaska Fairbanks, Dept Petr Engn, Fairbanks, AK 99775 USA
关键词
D O I
10.1021/jp074606m
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The lateral film growth rate of CH4, C2H4, CO2, CH4 + C2H4, and CH4 + C3H8 hydrates in pure water were measured at four fixed temperatures of 273.4, 275.4, 277.4, and 279.4 K by means of suspending a single gas bubble in water. The results showed that the lateral growth rates of mixed-gas CH4 + C2H4 hydrate films were slower than that of pure gas (CH4 or C2H4) for the same driving force and that of mixed-gas CH4 + C3H8 hydrate film growth was the slowest. The dependence of the thickness of hydrate film on the driving force was investigated, and it was demonstrated that the thickness of hydrate film was inversely proportional to the driving force. It was found that the convective heat transfer control model, reported in the literature could be used to formulate the lateral film growth rate vf with the driving force AT perfectly for all systems after introduction of the assumption that the thickness of hydrate films is inversely proportional to the driving force Delta T; i.e., v(f) = psi Delta T-5/2 is correct and independent of the composition of gas and the type of hydrate. The thicknesses of different gas hydrate films were estimated, and it is demonstrated that the thicknesses of mixed-gas hydrate films were thicker than those of pure gases, which was qualitatively consistent with the experimental result.
引用
收藏
页码:12485 / 12493
页数:9
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