Evaporation in Capillary Porous Media at the Perfect Piston‐Like Invasion Limit: Evidence of Nonlocal Equilibrium Effects

Moghaddam, Alireza Attari; Prat, Marc; Tsotsas, Evangelos; Kharaghani, Abdolreza

doi:10.1002/2017wr021162

Cited by 28 publications

(40 citation statements)

References 45 publications

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“…This dependency is however less pronounced in the networks with bimodal PSD. Similar moisture transport coefficient profiles are identified by Moghaddam et al [5], but only for the pore structures with monomodal PSD. As can also be seen, the value of moisture transport coefficient increases when altering the pore structure from monomodal PSD to bimodal PSD, especially in the period during which moisture transport occurs mainly through the liquid phase (Snet = 1.0-0.7).…”

Section: Simulation Resultssupporting

confidence: 81%

“…A three-dimensional network is virtually divided into horizontal slices with constant thickness ∆z at distinct times during the drying process. Details of this method is explained in Moghaddam et al [5].…”

Section: Parameter Functionsmentioning

confidence: 99%

“…Metzger et al [4] investigated how important is the role of pore structure (with monomodal pore size distribution (PSD) and bimodal PSD) on the intraparticle heat and mass transfer and thus drying kinetics. Vey recently, Moghaddam et al [5] assessed the classical continuum model by the help of pore network simulations. In these simulations pore networks were generated with a throat radius distribution of 250±25 µm, resulting in a network porosity of 0.594.…”

Section: Introductionmentioning

confidence: 99%

“…This void space overestimation is avoided in throat-pore-model (TPM), which is developed in this work. Moghaddam et al [5] calculated the continuum model parameters from TNM simulations. The results indicated that the moisture transport coefficient and the vapor pressure-saturation relationship are not unique over the entire drying process.…”

Section: Introductionmentioning

confidence: 99%

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Dependency of continuum model parameters on the spatially correlated pore structure studied by pore-network drying simulations

Kharaghani

Xiang

Tsotsas

2018

Proceedings of 21th International Drying Symposium

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Pore-network simulations are carried out for monomodal and bimodal pore structures with spatially correlated pore-size distributions. The internal and surface relationships between the partial vapor pressure and saturation as well as the moisture transport coefficient for these model porous structures are identified from the post-processing of the corresponding pore-network model solutions. The simulation results show that the deviation of the partial vapor pressure from the saturation vapor pressure in the presence of liquidwhich is referred to as non-local equilibrium effect -in the bimodal pore structures is less pronounced than in the monomodal pore structures. For the monomodal pore structures the moisture transport coefficient profile is not unique over the entire drying process, whereas this profile depends marginally on the drying history of the bimodal pore structures. Finally the ability of the continuum model to predict the results of the pore-network simulations for multiple realizations of the pore space is assessed.

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Section: Simulation Resultssupporting

confidence: 81%

Section: Parameter Functionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dependency of continuum model parameters on the spatially correlated pore structure studied by pore-network drying simulations

Kharaghani

Xiang

Tsotsas

2018

Proceedings of 21th International Drying Symposium

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“…If the effect of water vapor flow rate on the water film flow rate is not considered, the water film flow rate will be overestimated. This vapor flow rate could be calculated as [42] v…”

Section: Water Film Effectmentioning

confidence: 99%

An Improved Relative Permeability Model for Gas-Water Displacement in Fractal Porous Media

Wang

et al. 2019

Water

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Many researchers have revealed that relative permeability depends on the gas-water-rock interactions and ultimately affects the fluid flow regime. However, the way that relative permeability changes with fractal porous media has been unclear so far. In this paper, an improved gas-water relative permeability model was proposed to investigate the mechanism of gas-water displacement in fractal porous media. First, this model took the complexity of pore structure, geometric correction factor, water film, and the real gas effect into account. Then, this model was compared with two classical models and verified against available experimental data. Finally, the effects of structural parameters (pore-size distribution fractal dimension and tortuosity fractal dimension) on gas-water relative permeability were investigated. It was found that the sticking water film on the surface of fracture has a negative effect on water relative permeability. The increase of geometric correction factor and the ignorance of real gas effect cause a decrease of gas relative permeability.Water 2020, 12, 27 2 of 24 relative permeability is equal to 1, which does not agree with the actual fluid flow in porous media. Subsequently, this model was further modified by many scholars. Gates and Leitz [8] integrated the relative permeability from the capillary pressure. Burdine [9] thought that the assumption of capillary parallelism was not accurate and introduced the tortuosity factor into the Purcell model. Mualem [10] proposed an integration method based on the Purcell model. For simplicity, Romm [11] developed a relative permeability model which ignored the phase interference between the gas and water phases. This model is also called the X model. Brooks and Corey [12] introduced a pore-size distribution index to modify the capillary pressure function and proposed a more generalized gas-water relative permeability model. The Brooks-Corey model has been widely used in modeling two-phase flow in complex porous media. Fourar and Lenormand [13] derived a viscous coupling model after integrating Stokes' equation and the effect of viscosity. Combined with momentum balance, viscosity, and cubic law, Chima and Geiger [14] developed a new relative permeability model. After ignoring the capillary pressure, Chima's model became a unique form of the viscous coupling model. Li et al. [15] improved Chima's model through the consideration of the influences of capillary tortuosity and irreducible water saturation on relative permeability. The above relative permeability models have made significant contributions to the prediction of two-phase flow in porous media. They also found that the relative permeability of the gas phase is more susceptible to the geometry of flow channels. However, these relative permeability models did not thoroughly consider the effects of complex pore microstructures on fluid flow.

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A pore network study of evaporation from the surface of a drying non‐hygroscopic porous medium

et al. 2017

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The phenomena occurring at the surface of a porous medium during drying in the capillary regime are investigated by pore network simulations. The impact of the formation of wet and dry patches at the surface on the drying rate is studied. The simulations indicate an edge effect characterized by a noticeable variation of saturation in a thin layer adjacent to the porous surface. Also, the results indicate a significant nonlocal equilibrium effect at the surface. The simulation results are exploited to test Schlünder's classical model which offers a simple closure relationship between the evaporation rate and the degree of occupancy of the surface by the liquid. In addition to new insights into the surface phenomena, the results open up new prospects for improving the continuum models of the drying process. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1435–1447, 2018

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Evaporation in Capillary Porous Media at the Perfect Piston‐Like Invasion Limit: Evidence of Nonlocal Equilibrium Effects

Cited by 28 publications

References 45 publications

Dependency of continuum model parameters on the spatially correlated pore structure studied by pore-network drying simulations

Dependency of continuum model parameters on the spatially correlated pore structure studied by pore-network drying simulations

An Improved Relative Permeability Model for Gas-Water Displacement in Fractal Porous Media

A pore network study of evaporation from the surface of a drying non‐hygroscopic porous medium

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