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Jellali, Salah; Muntzer, P.; Razakarisoa, Olivier; Schäfer, Gerhard

doi:10.1023/a:1010652230922

Cited by 17 publications

(5 citation statements)

References 28 publications

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“…Two-phase flow in porous media is crucial in a variety of sectors, ranging from fundamental research to applications in a wide array of industrial sectors such as fuel cell [1] and solar cell technology [2], fiber-reinforced composite materials [3], textile fabric characterization [4], prospection and exploration of oil and gas [5][6][7][8] etc. The description of flows inside natural porous media, such as soils and rocks, is also crucial for the study of groundwater flows [9,10] and the treatment of soil contaminants [11][12][13] but it also matters for everyday tasks such as making a cup of coffee [14]. It is a multidisciplinary subject that has been investigated for decades by hydrologists, physicists, chemists, geoscientists, biologists, and engineers due to its practical importance and complexity.…”

Section: Introductionmentioning

confidence: 99%

Burst Dynamics, Upscaling and Dissipation of Slow Drainage in Porous Media

et al. 2021

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We present a theoretical and experimental investigation of drainage in porous media. The study is limited to stabilized fluid fronts at moderate injection rates, but it takes into account capillary, viscous, and gravitational forces. In the theoretical framework presented, the work applied on the system, the energy dissipation, the final saturation and the width of the stabilized fluid front can all be calculated if we know the dimensionless fluctuation number, the wetting properties, the surface tension between the fluids, the fractal dimensions of the invading structure and its boundary, and the exponent describing the divergence of the correlation length in percolation. Furthermore, our theoretical description explains how the Haines jumps’ local activity and dissipation relate to dissipation on larger scales.

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Section: Introductionmentioning

confidence: 99%

Burst Dynamics, Upscaling and Dissipation of Slow Drainage in Porous Media

et al. 2021

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“…but also because of direct environmental applications and economical aspects. Hydrologists, for example, have been interested in the description of flows inside soils and rocks, in the study of groundwater flows [30], and in the treatment of soil contaminants [31]. The dispersion of contaminants in porous and fractured networks [32] and the formation and evolution of fractures [33] have also been subjects of recent studies.…”

Section: Introductionmentioning

confidence: 99%

Connectivity enhancement due to film flow in porous media

et al. 2019

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We study the effects of connectivity enhancement due to film flow phenomena on the drainage of an artificial porous medium and the relative influence of gravity for such effects. The medium is initially fully saturated with a liquid (wetting phase), which is displaced by air (nonwetting phase). Our setup allows us to directly visualize the dynamics of the flow and, in particular, to pinpoint which pore invasion events are due to film flow phenomena. We have observed the formation of an active zone behind the liquid-air interface, inside which film flow drainage events are more likely to occur. Understanding the basic mechanisms of film flow in artificial porous media is of relevance for the analysis of real three-dimensional porous systems, in which gravity cannot be neglected and film flow is bound to be present.

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“…Two-phase flow is encountered widely in the fields of hydrology, among other reasons, because soil and groundwater pollution by Dense Non-Aqueous Phase Liquids (DNAPL), such as chlorinated solvents (e.g., trichloroethylene (TCE)) constitute a large and serious environmental problem [Cohen and Mercer , 1993]. Identification of pollution sources is difficult due to the fact that organic pollutants can rapidly migrate down to the bottom of the aquifer and/or along flow paths that differ from the water [Jellali et al, 2001;Bohy et al, 2006;Dridi et al, 2009;Nsir et al, 2012]. In addition, in both soil and groundwater, they are subject to natural attenuation.…”

Section: Introductionmentioning

confidence: 99%

Impact of sample geometry on the measurement of pressure‐saturation curves: Experiments and simulations

Moura

Fiorentino

Måløy

et al. 2015

Water Resources Research

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In this paper, we study the influence of sample geometry on the measurement of pressuresaturation relationships, by analyzing the drainage of a two-phase flow from a quasi-2-D random porous medium. The medium is transparent, which allows for the direct visualization of the invasion pattern during flow, and is initially saturated with a viscous liquid (a dyed glycerol-water mix). As the pressure in the liquid is gradually reduced, air penetrates from an open inlet, displacing the liquid which leaves the system from an outlet on the opposite side. Pressure measurements and images of the flow are recorded and the pressure-saturation relationship is computed. We show that this relationship depends on the system size and aspect ratio. The effects of the system's boundaries on this relationship are measured experimentally and compared with simulations produced using an invasion percolation algorithm. The pressure build up at the beginning and end of the invasion process are particularly affected by the boundaries of the system whereas at the central part of the model (when the air front progresses far from these boundaries), the invasion happens at a statistically constant capillary pressure. These observations have led us to propose a much simplified pressure-saturation relationship, valid for systems that are large enough such that the invasion is not influenced by boundary effects. The properties of this relationship depend on the capillary pressure thresholds distribution, sample dimensions, and average pore connectivity and its applications may be of particular interest for simulations of two-phase flow in large porous media.

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Untitled

Cited by 17 publications

References 28 publications

Burst Dynamics, Upscaling and Dissipation of Slow Drainage in Porous Media

Burst Dynamics, Upscaling and Dissipation of Slow Drainage in Porous Media

Connectivity enhancement due to film flow in porous media

Impact of sample geometry on the measurement of pressure‐saturation curves: Experiments and simulations

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