Capillary pressure at irregularly shaped pore throats: Implications for water retention characteristics

Suh, Hyoung Suk; Kang, Dong Hun; Jang, Jae‐Won; Kim, Kwang Yeom; Yun, Tae Sup

doi:10.1016/j.advwatres.2017.09.025

Cited by 31 publications

(19 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since the effect of preferential flow will be remarkable in leading the non-equilibrium fluid flow subsurface, accurate knowledge and description the preferential paths and interfacial dynamic of immiscible two-phase flow in rock mass and its influence factors are of great significance for the evaluation of oil or gas recovery 1,2 and predication of roadway rock disasters 3 due to the gas-liquid flow. Many studies have been conducted to analyze preferential flow in order to explore the influence factors including wettability 4–6 , capillary pressure 7,8 , injection rate 9 , viscosity ratio 6 and capillary number 10 . However, few experimental and numerical studies are available for quantitatively and visually elaborating the fundamental processes of preferential flow in real rock structures through the effect of pore morphology and channel size, due to the complexity and heterogeneity of porous structures of natural rocks.…”

Section: Introductionmentioning

confidence: 99%

Preferential Paths of Air-water Two-phase Flow in Porous Structures with Special Consideration of Channel Thickness Effects

Liu

Zhang

et al. 2019

Sci Rep

View full text Add to dashboard Cite

Accurate understanding and predicting the flow paths of immiscible two-phase flow in rocky porous structures are of critical importance for the evaluation of oil or gas recovery and prediction of rock slides caused by gas-liquid flow. A 2D phase field model was established for compressible air-water two-phase flow in heterogenous porous structures. The dynamic characteristics of air-water two-phase interface and preferential paths in porous structures were simulated. The factors affecting the path selection of two-phase flow in porous structures were analyzed. Transparent physical models of complex porous structures were prepared using 3D printing technology. Tracer dye was used to visually observe the flow characteristics and path selection in air-water two-phase displacement experiments. The experimental observations agree with the numerical results used to validate the accuracy of phase field model. The effects of channel thickness on the air-water two-phase flow behavior and paths in porous structures were also analyzed. The results indicate that thick channels can induce secondary air flow paths due to the increase in flow resistance; consequently, the flow distribution is different from that in narrow channels. This study provides a new reference for quantitatively analyzing multi-phase flow and predicting the preferential paths of immiscible fluids in porous structures.

show abstract

Section: Introductionmentioning

confidence: 99%

Preferential Paths of Air-water Two-phase Flow in Porous Structures with Special Consideration of Channel Thickness Effects

Liu

Zhang

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Therefore, the pore‐network model simulation needs to be carefully used to understand the gas bubble behavior (e.g., gas bubble stability in pore space) at the in situ condition. The capillary pressure for various irregular cross‐sectional shape in addition to perfectly circular section was investigated using the Lattice Boltzmann method (Kang et al, ; Suh et al, ).…”

Section: Discussionmentioning

confidence: 99%

Gas Bubble Migration and Trapping in Porous Media: Pore‐Scale Simulation

Mahabadi

Zheng²,

Yun

et al. 2018

JGR Solid Earth

Self Cite

View full text Add to dashboard Cite

Gas bubbles can be naturally generated or intentionally introduced in sediments. Gas bubble migration and trapping affect the rate of gas emission into the atmosphere or modify the sediment properties such as hydraulic and mechanical properties. In this study, the migration and trapping of gas bubbles are simulated using the pore‐network model extracted from the 3D X‐ray image of in situ sediment. Two types of bubble size distribution (mono‐sized and distributed‐sized cases) are used in the simulation. The spatial and statistical bubble size distribution, residual gas saturation, and hydraulic conductivity reduction due to the bubble trapping are investigated. The results show that the bubble size distribution becomes wider during the gas bubble migration due to bubble coalescence for both mono‐sized and distributed‐sized cases. And the trapped bubble fraction and the residual gas saturation increase as the bubble size increases. The hydraulic conductivity is reduced as a result of the gas bubble trapping. The reduction in hydraulic conductivity is apparently observed as bubble size and the number of nucleation points increase.

show abstract

“…Another advantage is the ability of the method to provide excellent result resolution for such problems that are not easily handled by traditional CFD methods. Many researchers have focused their efforts on determining the interactions and relevant parameters responsible for the hysteresis and details can be found in [13,14,15]. These works attempted to construct unique functions relating a combination capillary pressure, saturation and liquid-gas interfacial area.…”

Section: Introductionmentioning

confidence: 99%

“…Pore size distribution and infiltration depth In order to better characterize the porosity, individual pore size distributions have been calculated and the mean and standard errors at each depth within the medium calculated. Note that while the geometries are 3dimensional it is difficult to accurately determine and characterize pore sizes in 3 dimensions, though attempts have been made, such as by Suh et al[15]…”

mentioning

confidence: 99%

On the impact of porous media microstructure on rainfall infiltration of thin homogeneous green roof growth substrates

Pettersson

Maggiolo

Sasic

et al. 2020

Journal of Hydrology

View full text Add to dashboard Cite

Green roofs are considered an attractive alternative to standard storm water management methods; however one of the primary issues hindering their proliferation is the lack of data regarding their ability to retain and reduce storm water under a variety of climatic conditions. This lack of data is partly due to the complexity of physical processes involved, namely the heterogeneous microscopic behavior that characterize flows in unsaturated porous media.

show abstract

Capillary pressure at irregularly shaped pore throats: Implications for water retention characteristics

Cited by 31 publications

References 46 publications

Preferential Paths of Air-water Two-phase Flow in Porous Structures with Special Consideration of Channel Thickness Effects

Preferential Paths of Air-water Two-phase Flow in Porous Structures with Special Consideration of Channel Thickness Effects

Gas Bubble Migration and Trapping in Porous Media: Pore‐Scale Simulation

On the impact of porous media microstructure on rainfall infiltration of thin homogeneous green roof growth substrates

Contact Info

Product

Resources

About