Experimental and computational validation and verification of the Stokes-Darcy and continuum pipe flow models for karst aquifers with dual porosity structure

2011 ◽  
Vol 26 (13) ◽  
pp. 2031-2040 ◽  
Author(s):  
Xiaolong Hu ◽  
Xiaoming Wang ◽  
Max Gunzburger ◽  
Fei Hua ◽  
Yanzhao Cao
Keyword(s):  
Pipe Flow ◽  
Dual Porosity ◽  
Karst Aquifers ◽  
Validation And Verification ◽  
Flow Models ◽  
Porosity Structure ◽  
Computational Validation

scholarly journals Model development and analysis of coal permeability based on the equivalent characteristics of dual-porosity structure

2019 ◽  
Vol 17 (2) ◽  
pp. 313-327
Author(s):  
Haijun Guo ◽  
Kai Wang ◽  
Yuanping Cheng ◽  
Liang Yuan ◽  
Chao Xu
Keyword(s):  
Coalbed Methane ◽  
Model Development ◽  
Gas Pressure ◽  
Dual Porosity ◽  
Permeability Evolution ◽  
Evolution Law ◽  
Fracture Width ◽  
Coal Permeability ◽  
Porosity Structure ◽  
Gas Seepage

Abstract Mining is a dynamic fracture process of coal and/or rock. The structural failure of coal bodies will change the coal matrix-fracture characteristics and then affect the distribution characteristics of the coalbed methane (CBM). Because of the structural complexity of coal, the coal matrices and fractures will be assumed to the geometries with rule shapes when the gas seepage characteristics in coals are analyzed. The size of the simplified geometries is the equivalent scale of dual-porosity coal structures (i.e. the equivalent fracture width and equivalent matrix scale). In this paper, according to the reasonable assumptions with regarding to dual-porosity coal structures, a new coal permeability evolution model based on the equivalent characteristics of dual-porosity structure (ECDP model) was built and the effect of the equivalent characteristics of dual-porosity structure on the coal permeability evolution law was analyzed. It is observed that if the initial fracture porosity is constant and the equivalent matrix scale increases, the range in which the permeability of coal rises with rising gas pressure increases; if the equivalent fracture width decreases and the equivalent matrix scale is constant, the range in which the permeability of coal rises with rising gas pressure decreases. The ECDP model is more suitable for revealing the evolution law of the coal permeability when large deformations occur in the coal bodies and/or the coal structure is damaged irreversibly, especially during enhancing CBM recovery.

On the inverse problems for the coupled continuum pipe flow model for flows in karst aquifers

2012 ◽  
Vol 28 (6) ◽  
pp. 065003 ◽  
Author(s):  
Shuai Lu ◽  
Nan Chen ◽  
Bang Hu ◽  
Jin Cheng
Keyword(s):  
Inverse Problems ◽  
Pipe Flow ◽  
Flow Model ◽  
Karst Aquifers ◽  
Pipe Flow Model

Pipe Flow Models of a Kentucky Limestone Aquifer

Ground Water ◽  
1974 ◽  
Vol 12 (4) ◽  
pp. 202-205 ◽  
Author(s):  
John Thrailkill
Keyword(s):  
Pipe Flow ◽  
Limestone Aquifer ◽  
Flow Models

Calibrating the exchange coefficient in the modified coupled continuum pipe-flow model for flows in karst aquifers

2012 ◽  
Vol 414-415 ◽  
pp. 294-301 ◽  
Author(s):  
Nan Chen ◽  
Max Gunzburger ◽  
Bill Hu ◽  
Xiaoming Wang ◽  
Celestine Woodruff
Keyword(s):  
Pipe Flow ◽  
Flow Model ◽  
Karst Aquifers ◽  
Exchange Coefficient ◽  
Pipe Flow Model
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