Dynamics of Air Flow in Partially Water-Saturated Porous Media

IF 25.2 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Ilan Ben-Noah, Shmulik P. Friedman, Brian Berkowitz
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Abstract

Dynamics of flowing air in partially water-saturated, porous geological formations are governed by a wide range of forces and parameters. These dynamics are reviewed in the contexts of flow patterns that arise and the corresponding applicability of diverse modeling approaches. The importance of reliable gas-liquid flow models draws from the key role gases play in earth systems, and the various engineering practices involving air injection into geological formations. Here, we focus on air flow in water-wet porous media. We survey the factors that affect flow patterns and phase configurations, and the measures that quantify them. For single-phase flow in saturated media (i.e., air flow in dry media or water flow in water-saturated media), the continuum approach (Darcy's law) is generally applicable and offers a good interpretive tool. However, the coupled two-phase flow continuum approach appears appropriate only for phase-saturation degrees that allow both phases to be continuous in the flow domain. Furthermore, air flow in wet media is highly unstable. As a result, air commonly flows in preferential pathways or in the form of bubbles and ganglia, which are not amenable to continuum modeling. On the other hand, pore-scale models that account for the complex geometries and interfaces between the fluids and the media require extreme computational efforts, and generally inaccessible details on medium characteristics. Other stochastically-based representations, such as percolation theory, have value in the conceptualization of complex flow problems but demonstrate limited success in interpreting phase configurations, saturation degrees, and relative permeabilities.

部分水饱和多孔介质中空气流动动力学
在部分水饱和的多孔地质构造中,流动空气的动力学受到各种力和参数的控制。这些动力学在流动模式的背景下进行了审查,并提出了各种建模方法的相应适用性。可靠的气液流动模型的重要性来自于气体在地球系统中的关键作用,以及各种涉及向地质构造注入空气的工程实践。在这里,我们关注的是水湿多孔介质中的空气流动。我们调查了影响流型和相配置的因素,以及量化它们的措施。对于饱和介质中的单相流动(即干介质中的气流或水饱和介质中的水流),连续介质法(达西定律)一般适用,并提供了一个很好的解释工具。然而,耦合两相流连续方法似乎只适用于相饱和度允许两相在流域中连续的情况。此外,湿介质中的气流非常不稳定。因此,空气通常以优先路径或以气泡和神经节的形式流动,这是不适合连续体模型的。另一方面,考虑流体和介质之间复杂几何形状和界面的孔隙尺度模型需要极大的计算努力,并且通常无法获得介质特性的细节。其他基于随机的表示,如渗透理论,在复杂流动问题的概念化方面具有价值,但在解释相配置、饱和度和相对渗透率方面表现出有限的成功。
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
Reviews of Geophysics
Reviews of Geophysics 地学-地球化学与地球物理
CiteScore
50.30
自引率
0.80%
发文量
28
审稿时长
12 months
期刊介绍: Geophysics Reviews (ROG) offers comprehensive overviews and syntheses of current research across various domains of the Earth and space sciences. Our goal is to present accessible and engaging reviews that cater to the diverse AGU community. While authorship is typically by invitation, we warmly encourage readers and potential authors to share their suggestions with our editors.
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