用非润湿流体填充球形孔隙体的研究:建模方法与计算流体力学分析

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL
Amgad Salama, Jisheng Kou, Shuyu Sun, Mahmoud Hefny
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引用次数: 0

摘要

在动态孔隙网络模型和其他模型中,了解非润湿流体填充孔隙体的动态过程非常重要。它可以证明描述孔隙网络在吸水和排水过程中行为的不同规则背后的许多假设。它还能让我们深入了解与该系统相关的不同状态。充填过程始于孔隙入口处的接触线钉合。在充填过程中,可以识别出与接触线前进方式有关的三种状态。在前两种情况下,接触线固定在孔隙入口处,同时出现液滴;在第三种情况下,接触线离开孔隙入口,沿着孔隙表面前进。在短暂的第一种情况下,半月板曲率增大,相应的毛细管压力也随之增大;而在另外两种情况下,半月板曲率减小,毛细管压力也随之减小。这种行为导致非润湿流体侵入孔隙的速度发生变化。一开始会降低,然后随着半月板的移动而升高。半月板的曲率半径最终会增大到无穷大,此时界面会呈现扁平状。我们开发了一种一维建模方法,可以考虑所有这些情况。该模型还考虑了两种不相溶流体在粘度对比范围内的情况。模型还提供了入侵流体的平均速度、接触线位置、半月板曲率半径、新出现液滴的体积等详细信息。此外,还考虑了计算流体动力学(CFD)模拟,以确认所提出的界面命运,并提供一个比较框架。验证过程的结果表明,模型与 CFD 分析之间总体上非常吻合。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Investigation of the Filling of a Spherical Pore Body with a Nonwetting Fluid: A Modeling Approach and Computational Fluid Dynamics analysis

Investigation of the Filling of a Spherical Pore Body with a Nonwetting Fluid: A Modeling Approach and Computational Fluid Dynamics analysis

Understanding the dynamics of the filling process of a pore body with a nonwetting fluid is important in the context of dynamic pore network models and others. It can justify many of the assumptions behind the different rules that describe how the network behaves during imbibition and drainage processes. It also provides insight into the different regimes pertinent to this system. The filling process starts with the contact line pinning at the pore entrance. Three regimes can be identified during the filling process that is related to how the contact line advances. In the first two regimes, the contact line pins at the pore entrance while the emerging droplet develops, and in the third one, the contact line departs the entrance of the pore and advances along the pore surface. During the first regime, which is brief, the curvature of the meniscus increases, and likewise, the corresponding capillary pressure, while in the other two regimes, the curvature decreases and so does the capillary pressure. Such behavior results in the rate at which the nonwetting fluid invades the pore to change. It initially decreases, then increases as the meniscus advances. The radius of curvature of the meniscus, eventually, increases to infinity for which the interface assumes a flat configuration. A one-dimensional modeling approach is developed that accounts for all these regimes. The model also considers the two immiscible fluids over a wide spectrum of contrast in viscosity. Information about the mean velocity of the invading fluid, the location of the contact line, the radius of curvature of the meniscus, the volume of the emerging droplet, and several others are among the details that the model provides. A computational fluid dynamics (CFD) simulation has also been considered to confirm the proposed fates of the interface and to provide a framework for comparisons. The results of the validation process show, generally, a very good match between the model and the CFD analysis.

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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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