Thickness, stability and contact angle of liquid films on and inside nanofibres, nanotubes and nanochannels

Mattia, Davide; Starov, Victor; Semenov, S.

doi:10.1016/j.jcis.2012.06.051

Cited by 44 publications

(27 citation statements)

References 24 publications

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“…According to the thermodynamic equilibrium principle and G–M binary gas isothermal adsorption model, when the water film and gas reach an equilibrium, the separation pressure is related to the relative vapor pressure as follows:

\prod (h) = - \frac{italicRT}{V_{w}} \ln \frac{p}{p_{0}}

where V w is the molar volume of water, the universal gas constant is R = 8.314 J/(mol K), and T is the Kelvin temperature.…”

Section: Characteristics Of the Water Film And Microscopic Surface Fomentioning

confidence: 99%

“…For tight porous media, the Knudsen diffusion cannot be ignored, and Darcy's law is not valid; consequently, conventional fluid flow simulation methods are no longer applicable. Several scholars have performed experiments considering natural or artificially bonded porous media and demonstrated that the particle size and porosity have a significant effect on the fluid flow. However, experimental methods are rather time‐consuming and expensive.…”

Section: Introductionmentioning

confidence: 99%

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Three‐dimensional Lattice Boltzmann simulation of gas‐water transport in tight sandstone porous media: Influence of microscopic surface forces

Wang

Liu

et al. 2020

Energy Science & Engineering

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A three-dimensional two-phase Lattice Boltzmann model was developed and validated for the fundamental phenomena of gas-water transport in tight porous media considering microscopic forces, namely, the electrostatic and solid-liquid intermolecular forces. The thickness of the water film adhering to the porous media surface was calculated based on the principle of thermodynamic equilibrium and the gas-water electrostatic potential energy. The Lattice Boltzmann model simulations focused on the effects of the microscopic forces and water film thickness on the gas-water transport in tight porous media. The fluid flow in the porous media was simulated under different conditions for the characteristic length, interfacial tension, and displacement pressure gradient. The results confirmed that the gas-water transport is strongly affected by the microscopic forces in tight porous media and that the transport process is accompanied by a high seepage resistance. The seepage resistance is more pronounced in the case of smaller pores because the adhering water film is thicker and more stable. During the transport process, the water film may disintegrate under certain conditions, which would enhance the gas flow in the porous media. However, it is difficult to effectively improve the gas flow by increasing the displacement pressure gradient under microscopic forces; this can be attributed to the accumulation of water or increased seepage resistance dictated by the interfacial tension, which occurs more frequently with smaller pores. This paper provides a promising new perspective for efficiently improving the Lattice Boltzmann model for transport trends considering microscopic forces. K E Y W O R D S bounded water film, gas-water two-phase transport, Lattice Boltzmann model, microscopic surface force, tight sandstone gas reservoir | 1925 HU et al. egge (s) The position of the gas leading edge (x/L) The interfacial tension: 0.020 N/m The interfacial tension: 0.025 N/m The interfacial tension: 0.030 N/m The interfacial tension: 0.035 N/m The interfacial tension: 0.040 N/m 0 5 10 15 20 0 0 .2 0.4 0 .6 0.8 1 The breakthrough time of the leading edge (s) The position of the gas leading edge (x/L) The interfacial tension: 0.020 N/m The interfacial tension: 0.025 N/m The interfacial tension: 0.030 N/m The interfacail tension: 0.035 N/m The interfacial tension: 0.040 N/m

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\prod (h) = - \frac{italicRT}{V_{w}} \ln \frac{p}{p_{0}}

where V w is the molar volume of water, the universal gas constant is R = 8.314 J/(mol K), and T is the Kelvin temperature.…”

Section: Characteristics Of the Water Film And Microscopic Surface Fomentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Three‐dimensional Lattice Boltzmann simulation of gas‐water transport in tight sandstone porous media: Influence of microscopic surface forces

Wang

Liu

et al. 2020

Energy Science & Engineering

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“…The difference of pressure between the thin film and the bulk phase is given by:

p_{f} - p_{w} = Π (h)

where Π ( h ) is the disjoining pressure, MPa, which is the sum of a molecular force, an electrostatic force and a structural force . For completely wetting cases, the molecular force dominates the other components, and thus the molecular component is only considered in this work. For water film retention on a flat surface, the disjoining pressure is given by:

{normalΠ}_{flat} (h) = - \frac{A_{g w s}}{6 π h^{3}}

…”

Section: Water Retention Characteristicsmentioning

confidence: 99%

“…For water film retention inside a cylindrical surface, the disjoining pressure is given by

{normalΠ}_{circle} (h) = - \frac{A_{g w s}}{6 π h^{3}} \cdot \frac{L}{L - 2 h}

where A gws is the Hamaker constant for gas–water–solid interaction, J.…”

Section: Water Retention Characteristicsmentioning

confidence: 99%

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Effect of water saturation on gas slippage in circular and angular pores

Chen

et al. 2018

AIChE Journal

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A unified model for gas slip flow through circular and angular pores in both single phase flow and two-phase flow conditions is developed, and the effect of water saturation on gas slippage factors in different pore shapes are revealed. For circular pores, the water saturation retains as thin film binding on pore surfaces without changing the shape of the cross section, and the hydraulic diameters continuously reduce as water saturation increases, directly leading to an increase in the slippage factor. However, for angular pores, the water saturation retains as both films at boundaries and condensations at corners, and the film-water and corner-water gradually change their cross-section shape (from sharp corners to round corners), which further affects the gas slip behavior. Due to the presence of round corners, the ratio of the cross-sectional area and perimeter, which can also be regarded as the reciprocal of a specific surface area, can even increase at a low water saturation condition. Thus the collisions between gas molecules and pore boundaries weaken, resulting in a slight reduction in the gas slippage factor. This interesting finding in the angular pore case directly explains the contradiction of the published experimental results with the general knowledge (i.e., the gas slip factor always increases as water saturation increases). Thus, the validity of the common assumption regarding actual porous media as capillaries with a circular cross-section must be considered more carefully.

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Moisture Storage and Transport in Concrete

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Thickness, stability and contact angle of liquid films on and inside nanofibres, nanotubes and nanochannels

Cited by 44 publications

References 24 publications

Three‐dimensional Lattice Boltzmann simulation of gas‐water transport in tight sandstone porous media: Influence of microscopic surface forces

Three‐dimensional Lattice Boltzmann simulation of gas‐water transport in tight sandstone porous media: Influence of microscopic surface forces

Effect of water saturation on gas slippage in circular and angular pores

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