Abstract In this paper, the film growth of methane hydrate on ice is observed by optical scanning microscopy at 0.50, 0.75, and 1.00 MPa of super pressure at the equilibrium temperature, which is between 260.3 K and 274.0 K. Methane hydrate crystals grew along the gas–ice interface for all experimental conditions. The growth rates increased with a rise in the equilibrium temperature, and the super pressure up to 0.75 MPa. Since the state at the growing site can be assumed to be in equilibrium, it is likely that, at high equilibrium temperatures, the increased mobility of water molecules accelerates the growth of methane hydrate. The results suggest that a mass transfer of methane and water molecules is dominant, constituting a rate-limiting process for growth. Indeed, the super pressure and the equilibrium temperature are vital factors for the film growth of methane hydrate on ice.

中文翻译：

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冰表面甲烷水合物的成膜速率

摘要 本文利用光学扫描显微镜在 0.50、0.75 和 1.00 MPa 超压下，在 260.3 K 和 274.0 K 之间的平衡温度下观察到甲烷水合物在冰上的薄膜生长。甲烷水合物晶体沿冰层生长。所有实验条件下的气-冰界面。生长速率随着平衡温度的升高而增加，超压达到0.75 MPa。由于可以假设生长地点的状态处于平衡状态，因此在高平衡温度下，水分子流动性的增加可能会加速甲烷水合物的生长。结果表明，甲烷和水分子的传质占主导地位，构成了生长的限速过程。确实，