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Key Transport Mechanisms in Supercritical CO₂ Based Pilot Micromodels Subjected to Bottom Heat and Mass Diffusion

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1 Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China
2 University of Chinese Academy of Sciences, Beijing 100049, China
3 Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences, Beijing 100190, China

* Corresponding Author: Lin Chen. Email:

The International Conference on Computational & Experimental Engineering and Sciences 2023, 27(3), 1-2. https://doi.org/10.32604/icces.2023.010378

Abstract

The ambiguous dynamics associated with heat and mass transfer of invading carbon dioxide in sub-critical and supercritical states, as well as the response of pore-scale resident fluids, play a key role in understanding CO₂ capture and storage (CCUS) and the corresponding phase equilibrium mechanisms. To this end, this paper reveals the transport mechanisms of invading supercritical carbon dioxide (sCO₂) in polluted micromodels using a variant of Lattice-Boltzmann Color Fluid model and descriptive experimental data. The breakthrough time is evaluated by characterizing the displacement velocity, the capillary to pressuredifference ratio, and the transient heat and mass diffusion at a series of micromodels with scaling porethroats. Wet micromodels are also processed to establish a reference database towards a natural extension to saline aquifers. The prime recorded sub-regimes are remarkably categorized as oscillatory while the interfacial velocity of sCO₂/pollutant is jumping into oscillatory magnitudes. The transient saturation of sCO₂ would be significantly accelerated with decreasing pore-throats, demonstrating increased invasion efficiency. Accordingly, a special model would be established to account for the transport mechanisms of invading sCO₂ towards efficient geological sequestration.

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Keywords

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