Indexed by:期刊论文

Date of Publication:2014-12-01

Journal:RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A

Included Journals:SCIE、Scopus

Volume:88

Issue:12

Page Number:2265-2270

ISSN No.:0036-0244

Key Words:porous media; diffusion coefficient; mass transfer; magnetic resonance imaging

Abstract: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.