Combined inter- and intra-fracture free convection in fracture networks embedded in a low-permeability matrix

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • Katharina Vujevic
  • Thomas Graf
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Details

OriginalspracheEnglisch
Seiten (von - bis)52-63
Seitenumfang12
FachzeitschriftAdvances in water resources
Jahrgang84
Frühes Online-Datum29 Juli 2015
PublikationsstatusVeröffentlicht - Okt. 2015

Abstract

Density-driven, haline free convection in fractured porous rock is studied in a 3-dimensional numerical model to evaluate the onset and interdependence of intra- and interfracture convection. When the rock matrix allows for solute diffusion, the most likely mode of convection in a regular fracture circuit is interfracture convection along the circuit such that regular fracture circuits can be modeled in a reduced dimensionality (2D) model. The critical Rayleigh number for the onset of interfracture convection in a regular fracture circuit is determined to be half of the critical Rayleigh number for convection in a single vertical fracture. In more complex fracture networks, vertical "dead-end fractures" and additional fracture intersections complicate convective patterns. Combined inter- and intrafracture convection is possible, such that convection is hard to predict.

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Combined inter- and intra-fracture free convection in fracture networks embedded in a low-permeability matrix. / Vujevic, Katharina; Graf, Thomas.
in: Advances in water resources, Jahrgang 84, 10.2015, S. 52-63.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Vujevic K, Graf T. Combined inter- and intra-fracture free convection in fracture networks embedded in a low-permeability matrix. Advances in water resources. 2015 Okt;84:52-63. Epub 2015 Jul 29. doi: 10.1016/j.advwatres.2015.07.014
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abstract = "Density-driven, haline free convection in fractured porous rock is studied in a 3-dimensional numerical model to evaluate the onset and interdependence of intra- and interfracture convection. When the rock matrix allows for solute diffusion, the most likely mode of convection in a regular fracture circuit is interfracture convection along the circuit such that regular fracture circuits can be modeled in a reduced dimensionality (2D) model. The critical Rayleigh number for the onset of interfracture convection in a regular fracture circuit is determined to be half of the critical Rayleigh number for convection in a single vertical fracture. In more complex fracture networks, vertical {"}dead-end fractures{"} and additional fracture intersections complicate convective patterns. Combined inter- and intrafracture convection is possible, such that convection is hard to predict.",
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AU - Graf, Thomas

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