Investigating snap-off behavior during spontaneous imbibition in 3D pore-throat model by pseudopotential lattice Boltzmann method

IF 4 2区环境科学与生态学 Q1 WATER RESOURCES

Advances in Water Resources Pub Date : 2024-06-12 DOI:10.1016/j.advwatres.2024.104751

Jiangtao Zheng , Xinbao Qi , Wenbo Gong , Yufeng Bian , Yang Ju

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引用次数: 0

Abstract

As a result of complex pore-throat geometry and precursor corner flow, the snap-off of the non-wetting phase occurs during the spontaneous imbibition (SI) of wetting phase. However, accurate modeling of such pore-scale flow behavior remains a big challenge, and its influencing factors remain unclear. In this study, an improved pseudopotential lattice Boltzmann method (LBM) is used to analyze the snap-off behavior during the SI process in three-dimensional (3D) pore-throat models with rough surfaces. The influence of the pore-to-throat size ratio (λ), contact angles (θ), and Ohnesorge number (Oh) on the occurrence of the snap-off are investigated and based on which a 3D phase diagram is established. The snap-off is more likely to occur with the increase in λ and Oh and decrease in θ, respectively. Only when the λ is ≥2 and the θ is <13°, the snap-off may occur. With the increase in θ from 0° to 13°, the snap-off is suppressed due to the relatively small advancing difference between the corner flow and the bulk meniscus. Volume fraction of the entrapped gas bubble in the pore increases with the increase in λ and Oh and the decrease in θ. The time when snap-off occurred increases with the increase in λ and θ, and decrease in Oh. These results are fundamental for investigating snap-off phenomena in real 3D pore space and guide how to avoid or facilitate the occurrence of snap-off and to control the degree of snap-off.

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利用伪电位点阵玻尔兹曼法研究三维孔喉模型自发浸润过程中的断裂行为

由于复杂的孔喉几何形状和前驱角流，非润湿相会在润湿相的自发浸润（SI）过程中发生断裂。然而，这种孔隙尺度流动行为的精确建模仍是一个巨大挑战，其影响因素也仍不明确。本研究采用改进的伪电位晶格玻尔兹曼法（LBM）分析了具有粗糙表面的三维孔喉模型在 SI 过程中的快断行为。研究了孔喉尺寸比 (λ)、接触角 (θ) 和 Ohnesorge 数 (Oh) 对卡断发生的影响，并在此基础上建立了三维相图。随着 λ 和 Oh 的增大以及 θ 的减小，快断现象更容易发生。只有当 λ≥2 和 θ 为 <13° 时，才可能发生卡断。随着 θ 从 0° 增大到 13°，由于转角流和主体半月板之间的推进差相对较小，卡断现象被抑制。孔隙中夹带气泡的体积分数随 λ 和 Oh 的增大以及 θ 的减小而增大。这些结果对于研究真实三维孔隙空间中的快断现象具有重要意义，并指导如何避免或促进快断的发生以及控制快断的程度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Water Resources 环境科学-水资源

CiteScore

9.40

自引率

6.40%

发文量

171

审稿时长

36 days

期刊介绍： Advances in Water Resources provides a forum for the presentation of fundamental scientific advances in the understanding of water resources systems. The scope of Advances in Water Resources includes any combination of theoretical, computational, and experimental approaches used to advance fundamental understanding of surface or subsurface water resources systems or the interaction of these systems with the atmosphere, geosphere, biosphere, and human societies. Manuscripts involving case studies that do not attempt to reach broader conclusions, research on engineering design, applied hydraulics, or water quality and treatment, as well as applications of existing knowledge that do not advance fundamental understanding of hydrological processes, are not appropriate for Advances in Water Resources. Examples of appropriate topical areas that will be considered include the following: • Surface and subsurface hydrology • Hydrometeorology • Environmental fluid dynamics • Ecohydrology and ecohydrodynamics • Multiphase transport phenomena in porous media • Fluid flow and species transport and reaction processes