Speaker
Description
In this work, we report a continuum model that incorporates the percolation effect for slow evaporation in capillary porous media. In order to evaluate such continuum model, we perform a pore-scale simulation based on a large pore network composed of about 2.5 million pores. Key transport parameters, such as capillary pressure and relative permeability, are derived directly from the large pore-network simulations. It is revealed that the percolation effect should be considered in the continuum models in order to gain reasonable liquid saturation profile. The large pore network modeling shows that capillary pressure fluctuates with liquid saturation, different from the traditional capillary pressure curve that is monotonously varied with liquid saturation. Time averaging should be applied to such fluctuated capillary pressure data before they are employed in the continuum model. If the traditional capillary pressure versus liquid saturation is employed in the continuum model with the percolation effects, non-physical predictions are observed - specifically, an increase in liquid saturation near the open boundary during evaporation. Furthermore, we observe fluctuating liquid velocities within the porous medium, exhibiting turbulent-like behavior. This may indicate that combined volume and time averaging approach is needed to develop the accurate continuum model. These findings offer valuable insights for advancing the continuum model of evaporation in porous media.
| Country | 中国 |
|---|---|
| Green Housing & Porous Media Focused Abstracts | This abstract is related to Green Housing |
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