Research Article
Numerical Simulation of Seepage-Heat-Solid Coupling of Gas Seepage in Prepumped Boreholes under Electrothermal High Temperature Field
Table 1
Basic parameters of numerical simulation.
| | Gas dynamic viscosity coefficient/μ0 | Pa·s | Density of coal/ρc | |
| | Initial porosity of coal seam/φ0 | 0.045 | Gas volume strain constant/εL | 0.02295 | | Elastic modulus of coal/ | Pa | Ordinary gas constant/ | 8.3143 J/(Mol°C) | | Poisson’s ratio of coal/υ | 0.32 | Initial permeability/ | | | Initial gas pressure/ | 1 MPa | Volumetric thermal expansion coefficient of coal/β | °C-1 | | Initial temperature/ | 20°C | Specific heat capacity of coal skeleton/ | 1350 J/(kg°C) | | Langmuir pressure correction factor/ | 710 Pa-1 | Specific heat capacity of gas/ | 2160 J/(kg°C) | | Langmuir volume correction factor/ | 0.021°C-1 | Thermal conductivity of coal/η | 0.443 W/(m°C) | | Langmuir pressure constant/ | | Gas density under standard state/ρga | 0.716 kg/m3 | | Langmuir volume constant/ | 0.0477 m3/kg | Coefficient of thermal expansion of coal | /°C |
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