Fundamental study on the pore scale dissociation and transportation mechanism of methane hydrate in porous sediments contributes to understanding the heat and mass transfer in the multiple physicochemical and thermal processes. This paper proposes a novel enthalpy-porosity technique coupling with volume of fraction (VOF) method for modeling the phase-change process of the hydrate dissociation and the multi-phase flow. The mathematical models are programed by C language and used as the subroutine for the commercial FLUENT software. The proposed theoretical model is validated by comparison with the experiment and numerical modeling in literature. The distribution of fluid saturation, velocity and temperature in the MH dissociation are presented, analyzed and discussed comparatively. As the first effort in literature, the proposed model can properly simulate the effects of the phase change on the pore structure evolution, multiphase flow, heat and mass transfer and kinetic reaction process in porous media in real-time. Both the normalized permeability of water (KNw) and the normalized absolute permeability (KN) of the porous media with different hydrate saturation are acquired and analyzed comparatively with the results in the previous studies. This study provides a new insight into pore scale modeling on the multiphase flow with phase change.
|Original language||English (US)|
|State||Published - Jul 30 2021|
Bibliographical noteKAUST Repository Item: Exported on 2021-11-21
Acknowledged KAUST grant number(s): BAS/1/1351-1301
Acknowledgements: This work was financially supported by National Natural Science Foundation of China (Grant Number 51909225); King Abdullah University of Science and Technology (KAUST) (Grant Number BAS/1/1351-1301).
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