Capillarity in Soft Porous Solids

Ha, Jun Seok; Kim, Ho Young

doi:10.1146/annurev-fluid-010518-040419

Cited by 39 publications

(36 citation statements)

References 119 publications

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“…Imbibition phenomena are very common, occurring in life, material, chemistry, and energy. , For example, they occur in a system of two-phase flow in rocks. Imbibition has great prospects in the development of fractured, conventional, and unconventional oil and gas reservoirs.…”

Section: Introductionmentioning

confidence: 99%

A Critical Review of Enhanced Oil Recovery by Imbibition: Theory and Practice

Tian

Gao

et al. 2021

Energy Fuels

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Imbibition is very common, occurring in life, material, chemistry, and energy. It plays an important role in enhanced oil recovery (EOR). The development of many reservoirs is beneficial to the imbibition process, such as fractured reservoirs, conventional reservoirs developed by a water-injection mode of huff-n-puff in their later development, and unconventional reservoirs with abundant micro–nanopores developed by the fracturing technology. Here, we present a critical review of EOR through imbibition. First, the mechanisms of EOR through imbibition are reviewed, including the mechanical analysis of imbibition in a capillary, imbibition models for rocks, and the scaling law. Then, the governing factors of EOR by imbibition are summarized, including the properties of rocks and fluids and the effects of the temperature and pressure. Besides, the EOR by imbibition in the oil and gas development is discussed, including the roles of surfactants, nanofluids, salinity, shut-in time, and injection/production rates. Finally, conclusions and outlooks are presented. This review provides systematic and recent insights about EOR by imbibition and a direction for future research on this topic, which can help for a better understanding of EOR by imbibition.

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Section: Introductionmentioning

confidence: 99%

A Critical Review of Enhanced Oil Recovery by Imbibition: Theory and Practice

Tian

Gao

et al. 2021

Energy Fuels

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“…Here, the permeability, which quantifies how easily liquids can flow through a porous wick, is proportional to the crosssectional area of the flow. 40 The capillary flow is also affected by the pore size, r p . Thus, the ratio of the permeability to pore size, K/r p , is a key parameter in the wetting performance of a porous wick.…”

Section: Resultsmentioning

confidence: 99%

“…In general, the capillary flow in porous media can be simply described by Darcy’s law, where the length of the wetted area ( l w ) is a function of time ( t ), liquid properties including surface tension (γ) and viscosity (μ), and wick structure including permeability ( K ) and pore size ( r p ): l w ∼ [(4γ/μ)( K / r p ) t ] 1/2 . Here, the permeability, which quantifies how easily liquids can flow through a porous wick, is proportional to the cross-sectional area of the flow . The capillary flow is also affected by the pore size, r p .…”

Section: Resultsmentioning

confidence: 99%

Scalable High-Efficiency Bi-Facial Solar Evaporator with a Dendritic Copper Oxide Wick

Kim

Choi

Cho

et al. 2021

ACS Appl. Mater. Interfaces

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Solar thermal distillation is a promising way to harvest clean water due to its sustainability. However, the energy density of solar irradiation inevitably demands scalability of the systems. To realize practical applications, it is highly desirable to fabricate meter-scale solar evaporator panels with high capillary performance as well as optical absorptance using scalable and high-throughput fabrication methods. Here, we demonstrate a truly scalable fabrication process for a bi-facial solar evaporator with copper oxide dendrites via the hydrogen bubble templated electrochemical deposition technique. Furthermore, we construct a theoretical model combining capillarity and evaporative mass transfer, which leads to optimal operation conditions and wick characteristics, including superhydrophilicity, extreme capillary performance, and omni-angular high optical absorptance. The fabricated porous surfaces with excellent capillary performance and productivity provide a pathway toward a highly efficient bi-facial solar evaporator panel with meter-level scalability.

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“…This is easy in a through-hole or larger diameter hole due to capillary action or Rayleigh-Taylor instability. However, it is difficult for liquid to enter small holes if one end is closed due to surface tension because it prevents gas-liquid interface deformation on a smaller, capillary-length scale [4][5][6]. Furthermore, gas dissolution with pressurization is no longer expected for large-aspect ratio holes because the gas volume becomes relatively large.…”

Section: Introductionmentioning

confidence: 99%

Removing Gas from a Closed-End Small Hole by Irradiating Acoustic Waves with Two Frequencies

2022

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Filling microstructures in the air with liquid or removing trapped gases from a surface in a liquid are required in processes such as cleaning, bonding, and painting. However, it is difficult to deform the gas–liquid interface to fill a small hole with liquid when surface tension has closed one end. Therefore, it is necessary to have an efficient method of removing gas from closed-end holes in liquids. Here, we demonstrate the gas-removing method using acoustic waves from small holes. We observed gas column oscillation by changing the hole size, wettability, and liquid surface tension to clarify the mechanism. First, we found that combining two different frequencies enabled complete gas removal in water within 2 s. From high-speed observation, about half of the removal was dominated by droplet or film formation caused by oscillating the gas column. The other half was dominated by approaching and coalescing the divided gas column. We conclude that the natural frequency of both the air column and the bubbles inside the tube are important.

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Capillarity in Soft Porous Solids

Cited by 39 publications

References 119 publications

A Critical Review of Enhanced Oil Recovery by Imbibition: Theory and Practice

A Critical Review of Enhanced Oil Recovery by Imbibition: Theory and Practice

Scalable High-Efficiency Bi-Facial Solar Evaporator with a Dendritic Copper Oxide Wick

Removing Gas from a Closed-End Small Hole by Irradiating Acoustic Waves with Two Frequencies

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