Fracture-Flow-Enhanced Solute Diffusion into Fractured Rock

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We propose a new conceptual model of fracture-flow-enhanced matrix diffusion, which correlates with fracture-flow velocity, i.e., matrix diffusion enhancement induced by rapid fluid flow within fractures. According to the boundary-layer or film theory, fracture flow enhanced matrix diffusion may dominate mass-transfer processes at fracture-matrix interfaces, because rapid flow along fractures results in large velocity and concentration gradients at and near fracture-matrix interfaces, enhancing matrix diffusion at matrix surfaces. In this paper, we present a new formulation of the conceptual model for enhanced fracture-matrix diffusion, and its implementation is discussed using existing analytical solutions and numerical models. In addition, we use ... continued below

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Wu, Yu-Shu; Ye, Ming & Sudicky, E.A. December 15, 2007.

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We propose a new conceptual model of fracture-flow-enhanced matrix diffusion, which correlates with fracture-flow velocity, i.e., matrix diffusion enhancement induced by rapid fluid flow within fractures. According to the boundary-layer or film theory, fracture flow enhanced matrix diffusion may dominate mass-transfer processes at fracture-matrix interfaces, because rapid flow along fractures results in large velocity and concentration gradients at and near fracture-matrix interfaces, enhancing matrix diffusion at matrix surfaces. In this paper, we present a new formulation of the conceptual model for enhanced fracture-matrix diffusion, and its implementation is discussed using existing analytical solutions and numerical models. In addition, we use the enhanced matrix diffusion concept to analyze laboratory experimental results from nonreactive and reactive tracer breakthrough tests, in an effort to validate the new conceptual model.

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  • Thirty-Third Workshop on Geothermal ReservoirEngineering, Stanford, CA, 01/28/2008-01/30/2008

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  • Report No.: LBNL--63700
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 928892
  • Archival Resource Key: ark:/67531/metadc894375

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  • December 15, 2007

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 5, 2016, 4:18 p.m.

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Wu, Yu-Shu; Ye, Ming & Sudicky, E.A. Fracture-Flow-Enhanced Solute Diffusion into Fractured Rock, article, December 15, 2007; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc894375/: accessed November 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.