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Investigating snap-off behavior during spontaneous imbibition in 3D pore-throat model by pseudopotential lattice Boltzmann method
Advances in Water Resources ( IF 4.0 ) Pub Date : 2024-06-12 , DOI: 10.1016/j.advwatres.2024.104751
Jiangtao Zheng , Xinbao Qi , Wenbo Gong , Yufeng Bian , Yang Ju

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 (), contact angles (), and Ohnesorge number () 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 and and decrease in , respectively. Only when the is ≥2 and the θ is <13°, the snap-off may occur. With the increase in 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 and and the decrease in . The time when snap-off occurred increases with the increase in and , and decrease in . 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.

中文翻译:


利用赝势格玻尔兹曼法研究 3D 孔喉模型中自发渗吸过程中的折断行为



由于复杂的孔喉几何形状和前体角流,非润湿相的折断发生在润湿相的自发渗吸(SI)期间。然而,对这种孔隙尺度流动行为的精确建模仍然是一个巨大的挑战,其影响因素仍不清楚。在这项研究中,采用改进的赝势格子玻尔兹曼方法(LBM)来分析具有粗糙表面的三维(3D)孔喉模型中SI过程中的折断行为。研究了孔喉尺寸比 ()、接触角 () 和 Ohnesorge 数 () 对折断发生的影响,并在此基础上建立了 3D 相图。分别随着 和 的增加和减少而更有可能发生突变。只有当θ≥2且θ<13°时,才会发生折断。随着从 0° 增加到 13°,由于角流和大弯液面之间的前进差异相对较小,因此抑制了折断。孔隙中截留气泡的体积分数随着 和 的增加而增加,随着 的减少而增加。发生突变的时间随着 和 的增加而增加,随着 的减少而增加。这些结果对于研究真实3D孔隙空间中的折断现象具有基础,并指导如何避免或促进折断的发生以及控制折断的程度。
更新日期:2024-06-12
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