Numerical Analysis of Mass and Heat Transfer During the Dissociation Process of Natural Gas Hydrate in Unsaturated Porous Media by Peridynamic
摘要
The numerical simulation and analysis of natural gas hydrates with heat and mass transfer are essential for identifying and predicting reservoir states during dissociation and seepage processes. In specific cases, the transported substance may undergo phase transitions between solid, liquid, or gas states during dissociation and hydration processes. To effectively predict hydrate dissociation performance influenced by multi-field coupling processes, this study proposes a novel bond-based peridynamic coupled finite difference model that accounts for gas-liquid two-phase seepage behavior. The developed peridynamic (PD) model simulates hydrate dissociation reactions accompanied by gas-liquid seepage, mass transfer, and heat transfer phenomena. The formulation demonstrates strong agreement with established analytical solutions for one-dimensional problems and finite element transient solutions for two-dimensional problems in the literature, validating the accuracy and reliability of the newly constructed model. This research presents an innovative approach to simulate heat transport and multiphase flow phenomena associated with hydrate dissociation.