Effects of gravity and buoyancy on spontaneous liquid-liquid imbibition in fractured porous media

Q1 Physics and Astronomy

Capillarity Pub Date : 2023-11-04 DOI:10.46690/capi.2024.01.01

Hui Cheng, Fuyong Wang

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引用次数: 0

Abstract

Spontaneous imbibition in porous materials has received significant attention in recent decades; however, spontaneous liquid-liquid imbibition in fractures has not been well studied. Specifically, the mechanism behind the influence of gravity and buoyancy on the spontaneous imbibition of wetting phase fluid into fractured porous media remains uncertain. In this study, an analytical solution for spontaneous imbibition in fractured porous media under the influence of gravity and buoyancy is presented. The results show that imbibition velocity with buoyancy and gravity is faster than that without these forces. The effect of buoyancy and gravity on imbibition velocity increases with rising fracture aperture and length. When the fracture aperture is less than 1 μm, the relative deviation between imbibition height with and without gravity and buoyancy is about 50%. On the other hand, when the fracture aperture is greater than 1 μm, the relative deviation is proportional to the fracture aperture. The relative reduction in imbibition height over time is not obvious when the fracture aperture is the same. In the process of water-oil spontaneous imbibition, the effect of buoyancy and gravity is more pronounced at low oil-water interfacial tension. Therefore, the effect of buoyancy and gravity on spontaneous imbibition cannot be ignored under this condition. Document Type: Original article Cited as: Cheng, H., Wang, F. Effects of gravity and buoyancy on spontaneous liquid-liquid imbibition in fractured porous media. Capillarity, 2024, 10(1): 1-11. https://doi.org/10.46690/capi.2024.01.01

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重力和浮力对裂缝性多孔介质液-液自发吸胀的影响

近几十年来，多孔材料中的自发渗吸现象受到了广泛的关注。然而，裂缝中自发液-液吸胀的研究还不够深入。具体来说，重力和浮力对湿相流体在裂缝性多孔介质中自发吸胀的影响机制尚不确定。本文提出了重力和浮力作用下裂缝性多孔介质自发渗吸的解析解。结果表明，有浮力和重力作用的吸胀速度比无重力作用的吸胀速度快。浮力和重力对吸胀速度的影响随裂缝孔径和裂缝长度的增大而增大。当裂缝孔径小于1 μm时，有重力和无浮力作用时吸胀高度的相对偏差约为50%。而当裂缝孔径大于1 μm时，相对偏差与裂缝孔径成正比。当裂缝孔径相同时，渗吸高度随时间的相对降低不明显。在水-油自发渗吸过程中，在低油水界面张力条件下，浮力和重力的作用更为明显。因此，在此条件下，浮力和重力对自发吸胀的影响是不可忽视的。程辉，王峰。重力和浮力对裂缝性多孔介质液-液自发吸胀的影响。毛细管学，2024,10(1):1-11。https://doi.org/10.46690/capi.2024.01.01

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来源期刊

Capillarity Physics and Astronomy-Surfaces and Interfaces

CiteScore

7.10

自引率

0.00%

发文量

审稿时长

2~3 weeks

期刊介绍： Capillarity publishes high-quality original research articles and current reviews on fundamental scientific principles and innovations of capillarity in physics, chemistry, biology, environmental science and related emerging fields. All advances in theoretical, numerical and experimental approaches to capillarity in capillary tube and interface dominated structure and system area are welcome. The following topics are within (but not limited to) the scope of capillarity: i) Capillary-driven phenomenon in natural/artificial tubes, porous and nanoporous materials ii) Fundamental mechanisms of capillarity aided by theory and experiments iii) Spontaneous imbibition, adsorption, wicking and related applications of capillarity in hydrocarbon production, chemical process and biological sciences iv) Static and dynamic interfacial processes, surfactants, wettability, film and colloids v) New approaches and technologies on capillarity Capillarity is a quarterly open access journal and free to read for all. The journal provides a communicate platform for researchers who are interested in all fields of capillary phenomenon.