Pore-scale numerical study of the non-isothermal reactive flow by the lattice Boltzmann method

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In the study of the porous-media-dissolution process, the transform of heat is usually ignored, which plays a profoundly important role. During the CO2 sequestration process, salt phases will dissolution under the combined action of CO2 and water. Temperature controls the dissolution rate of the salt phase and the diffusion rate of salt ions in water. This study constructs a lattice Boltzmann model that couples heat transfer, mass transfer, and fluid flow to investigate the effect of non-isothermal mass transfer on the dissolution process in porous media. It is found that the heat transfer plays a vital role in the dissolution process of porous media. The results show that the evolution of temperature has a significant influence on the changes of the porous structure and the dissolution model. And under the condition of low-temperature injection, the evolution of the erosion morphology of porous media shows more complex changes. This research provides a new perspective for optimizing the application of porous media in engineering and lays a theoretical foundation for further studies on the impact of temperature on dissolution processes, especially in the engineering applications involving chemical reaction flows.