›› 2010, Vol. 31 ›› Issue (11): 3361-3366.

• Fundamental Theroy and Experimental Research •     Next Articles

Study of permeability in single fracture under effects of coupled fluid flow and chemical dissolution

SU Bao-yu1，ZHANG Wen-jie 1, 2，SHENG Jin-chang1，XU Xiao-chen3，ZHAN Mei-li1，LIU Ji-shan4   

  1. 1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China; 2. Jiangxi Provincial Department of Water Resources, Nanchang 330009, China; 3. Guangchuan Engineering Consulting Corporation, Hangzhou 310000, China; 4. School of Mechanical and Chemical Engineering, The University of West Australia, Perth, Australia
  • Received:2009-08-31 Online:2010-11-10 Published:2010-11-24

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Abstract:

A two-dimensional numerical model of coupled fluid flow and chemical dissolution processes in single fracture is presented in order to understand permeability changes of single rock fracture in the coupled fluid flow and mineral chemical dissolution processes. The numerical model is solved by using a COMSOL Multiphysics-based simulator, which is the first engineering tool that performs partial differential equation-based multiphysics modeling in an interactive environment. The model is validated through comparing our numerical results with the known experimental measurements in salt rock reported by the reference [1], which shows our model is credible. A rough fracture is generated numerically by using fractal theory and used in the simulation of coupled fluid flow and mineral chemical dissolution processes of a rough fracture in limestone. The simulated results indicate that: (1) The solute concentration plays an important role on the dissolution process; this causes that the dissolved thickness at inlet is bigger than that at outlet. (2) The permeability of fracture increases exponentially with time during the dissolution process.

Key words: rock fracture, coupled fluid flow and chemical dissolution processes, numerical model, fractal theory

CLC Number: 

  • TU452
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