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论文类型：期刊论文

发表时间：2014-12-01

发表刊物：RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A

收录刊物：SCIE、Scopus

卷号：88

期号：12

页面范围：2265-2270

ISSN号：0036-0244

关键字：porous media; diffusion coefficient; mass transfer; magnetic resonance imaging

摘要：In this study, the dual-chamber pressure decay method and magnetic resonance imaging (MRI) were used to dynamically visualize the gas diffusion process in liquid-saturated porous media, and the relationship of concentration-distance for gas diffusing into liquid-saturated porous media at different times were obtained by MR images quantitative analysis. A non-iterative finite volume method was successfully applied to calculate the local gas diffusion coefficient in liquid-saturated porous media. The results agreed very well with the conventional pressure decay method, thus it demonstrates that the method was feasible of determining the local diffusion coefficient of gas in liquid-saturated porous media at different times during diffusion process.