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Description
Confinement effects cause fluid phase behaviors in nanoporous media to deviate from that under bulk conditions, while the presence of water further exacerbates the complexity. This study employs Monte Carlo simulations to investigate the vapor-liquid equilibrium of pure C3H8 and the CO2/C3H8 binary system confined in quartz nanopores, with a focus on the influence of water-bearing conditions. For pure C3H8, nanoconfinement increases vapor density while reducing liquid density, leading to significant decreases in critical point. The Kelvin equation exhibits 40.20% deviations in predicting saturation pressure at 3 nm pore width, indicating that conventional models need to be revised under high confinement conditions. For the CO2/C3H8 system, competitive adsorption causes C3H8 to be preferentially enriched in the vapor phase, while CO2 becomes relatively concentrated in the liquid phase due to the reduced liquid density of C3H8. Meanwhile, nanoconfinement suppresses bubble point pressure below bulk dew point pressure and reduces critical pressure by 71.11% in 3 nm pores relative to bulk conditions. Under water-bearing conditions, water film intensifies confinement effects by reducing effective pore volume, replacing the original interface between the pore surface and the CO2-hydrocarbon. The strongest suppression of phase behavior occurs as the water film transitions from partial to full wall coverage (0 – 10% water saturation), with further water saturation increases causing attenuated suppression. This work advances the fundamental understanding of fluid phase behavior under water-bearing nanoconfinement.
| Country | China |
|---|---|
| Green Housing & Porous Media Focused Abstracts | This abstract is related to Green Housing |
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