Interaction between corner and bulk flows during drainage in granular porous media

IF 4 2区 环境科学与生态学 Q1 WATER RESOURCES
Paula Reis , Gaute Linga , Marcel Moura , Per Arne Rikvold , Renaud Toussaint , Eirik Grude Flekkøy , Knut Jørgen Måløy
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Abstract

Drainage of a liquid by a gas in porous media can be broken down into two main mechanisms: a primary piston-like displacement of the interfaces through the bulk of pore bodies and throats, and a secondary slow flow through corners and films in the wake of the invasion front. In granular porous media, this secondary drainage mechanism unfolds in connected pathways of pendular structures, such as capillary bridges and liquid rings, formed between liquid clusters. To represent both mechanisms, we proposed a dynamic dual-network model for drainage, considering that a gas displaces a wetting liquid from quasi-2D granular porous media. For this model, dedicated analyses of the capillary bridge shapes and hydraulic conductivity were conducted so that the secondary drainage mechanism could be properly quantified at finite speeds. With the model, an investigation of the wetting-phase connectivity and flow during drainage was carried out, covering a broad range of flow conditions. Results indicate that the span of liquid-connected structures in the unsaturated region, as well as their ability to contribute to flow, varies significantly with Capillary and Bond numbers.

Abstract Image

颗粒状多孔介质排水过程中角流与体流的相互作用
在多孔介质中,气体对液体的排水可以分为两种主要机制:通过孔体和喉道的初级活塞式界面位移,以及在侵入面之后通过拐角和膜的次级缓慢流动。在颗粒状多孔介质中,这种二次排水机制在液体团簇之间形成的毛细管桥、液环等钟摆结构的连通通道中展开。为了代表这两种机制,我们提出了一个动态的双网络排水模型,考虑到气体取代了准二维颗粒多孔介质中的润湿液体。对于该模型,进行了毛细管桥形状和水力导电性的专门分析,以便在有限速度下适当地量化二次排水机制。利用该模型,研究了湿相连通性和排水过程中的流动,涵盖了广泛的流动条件。结果表明,非饱和区液连接结构的跨度及其对流动的贡献能力随毛细管数和键数的变化而显著变化。
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来源期刊
Advances in Water Resources
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
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