Experimental evidence of the anisotropy of tracer dispersion in rough fractures with sheared walls

Boschan, Alejandro; Auradou, Harold; Ippolito, I.; Chertcoff, R.; Hulin, Jean-Pierre

doi:10.1029/2008wr007461

Cited by 5 publications

(18 citation statements)

References 17 publications

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“…When flow occurs along that particular direction, solute particles rapidly spread (see the long structures in Fig.5b) along these channels (white regions in Fig.5c). A systematic comparison between the geometry of the iso-concentration front c(x, y, t) = 0.5 and the stratified model [78,79] demonstrate, for this flow configuration, that the heterogeneity factor constant along the full length of the fracture remains over the entire fracture length. These results are not valid any more when the flow is parallel to the direction of the shear displacement (i.e.…”

Section: Hydrodynamic Dispersion Of Dissolved Speciesmentioning

confidence: 90%

“…This study indicate that tracer transport in a single fracture over short distance may be considered as resulting from poorly connected parallel channels but as the distance increase the number of possible interconnection between these isolated channels increases which slowly reduces the influence of the localization of the flow. The situation were the fracture walls are laterally displaced is analyzed in Refs [78,79].…”

Section: Hydrodynamic Dispersion Of Dissolved Speciesmentioning

confidence: 99%

“…These results are not valid any more when the flow is parallel to the direction of the shear displacement (i.e. perpendicular to the channels) [79]: in this case the breakthrough curves are fitted with the solution of the ADE equations and mainly reflect the dispersion induced by the velocity profile in the fracture gap (Taylor dispersion [81]).…”

Section: Hydrodynamic Dispersion Of Dissolved Speciesmentioning

confidence: 99%

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Influence of wall roughness on the geometrical, mechanical and transport properties of single fractures

Auradou¹

2009

J. Phys. D: Appl. Phys.

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This article reviews the main features of the transport properties of single fractures. A particular attention paid to fractures in geological materials which often display a roughness covering a broad range of length scales. Because of the small distance separating the fracture walls, the surface roughness is a key parameter influencing the structure of the void space. Studies devoted to the characterization of the surface roughness are presented as well as works aimed at characterizing the void space geometry. The correlation of the free space is found to be crucially function of the failure mechanism (brittle, quasi brittle or plastic...) but also of possible shear displacements during the failure. The influence of the surface roughness on the mechanical behavior of fractures under a normal load and a shear stress is also described. Finally, experimental, numerical and theoretical works devoted to the study of the influence of the fracture void geometry on the permeability and on the hydrodynamic dispersion of a dissolved species are discussed.

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Section: Hydrodynamic Dispersion Of Dissolved Speciesmentioning

confidence: 90%

Section: Hydrodynamic Dispersion Of Dissolved Speciesmentioning

confidence: 99%

Section: Hydrodynamic Dispersion Of Dissolved Speciesmentioning

confidence: 99%

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Influence of wall roughness on the geometrical, mechanical and transport properties of single fractures

Auradou¹

2009

J. Phys. D: Appl. Phys.

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“…In subsurface flow, the phase carrying the solute is often modeled as a single fluid with given viscous properties (aqueous solutions, polymers) flowing at low flow Re number, or eventually as a multiphase flow for example in hydrocarbon related applications. The geometry of the media plays in all cases a crucial role in the dispersion of the solute [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Light transmission measurement of solute dispersion in non-Brownian suspension flow

Boschan

Poblete

Roht

et al. 2014

Eur. Phys. J. Appl. Phys.

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We characterize and employ a light transmission technique to measure the dispersivity of a solute in the flow of a neutrally-buoyant non-Brownian spherical particle suspension in a Hele-Shaw cell (parallelplate axial flow). Particle radii (a) were 20 and 40 μm, the particle bulk volume fraction φ bulk was 0.2, and the cell aperture was 420 ± 10 μm. In each displacement experiment a suspension with a colouring solute displaces a transparent one at constant flow rates ranging from 0.721 to 0.928 mL/min (corresponding to solute Péclet numbers (P e s) between 350 and 450). A reference measurement, identical to the displacement ones but without particles in the flow (φ bulk = 0), were performed in the same experimental assembly for comparison purposes. A light calibration related the transmitted intensity I to the solute concentration c for each combination of φ bulk and a. The time variation of the solute concentration was found to be well-fitted by the solution of the advection-dispersion equation (ADE) in the range of P es studied, and consequently a dispersion coefficient D and a dispersivity l d of the solute were measured.

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“…More recently, Boschan et al (2009) used a light transmission technique and transparent rough fracture models to measure dispersion for flow either parallel or normal to the shear. The features of the dispersion process are very different in the two cases.…”

Section: Introductionmentioning

confidence: 99%

Characterization of fracture aperture field heterogeneity by electrical resistance measurement

Boschan

Ippolito

Chertcoff

et al. 2011

Journal of Contaminant Hydrology

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We use electrical resistance measurements to characterize the aperture field in a rough fracture. This is done by performing displacement experiments using two miscible fluids of different electrical resistivity and monitoring the time variation of the overall fracture resistance. Two fractures have been used: their complementary rough walls are identical but have different relative shear displacements which create "channel" or "barrier" structures in the aperture field, respectively parallel or perpendicular to the mean flow velocity U(→). In the "channel" geometry, the resistance displays an initial linear variation followed by a tail part which reflects the velocity contrast between slow and fast flow channels. In the "barrier" geometry, a change in the slope between two linear zones suggests the existence of domains of different characteristic aperture along the fracture. These variations are well reproduced analytically and numerically using simple flow models. For each geometry, we present then a data inversion procedure that allows one to extract the key features of the heterogeneity from the resistance measurement.

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Experimental evidence of the anisotropy of tracer dispersion in rough fractures with sheared walls

Cited by 5 publications

References 17 publications

Influence of wall roughness on the geometrical, mechanical and transport properties of single fractures

Influence of wall roughness on the geometrical, mechanical and transport properties of single fractures

Light transmission measurement of solute dispersion in non-Brownian suspension flow

Characterization of fracture aperture field heterogeneity by electrical resistance measurement

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