| Abstract
| - The lateral film growth rate of CH4, C2H4, CO2, CH4 + C2H4, and CH4 + C3H8 hydrates in pure water weremeasured at four fixed temperatures of 273.4, 275.4, 277.4, and 279.4 K by means of suspending a single gasbubble in water. The results showed that the lateral growth rates of mixed-gas CH4 + C2H4 hydrate filmswere 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 drivingforce was investigated, and it was demonstrated that the thickness of hydrate film was inversely proportionalto the driving force. It was found that the convective heat transfer control model reported in the literaturecould be used to formulate the lateral film growth rate vf with the driving force ΔT perfectly for all systemsafter introduction of the assumption that the thickness of hydrate films is inversely proportional to the drivingforce ΔT; i.e., vf = ψΔT5/2 is correct and independent of the composition of gas and the type of hydrate. Thethicknesses 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 experimentalresult.
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