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Computational fluid dynamics simulation of coal ash filling in underground mine cavity

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Abstract

Coal fly ash waste from thermal power plants has recently been considered as a fill material for abandoned coal mine voids in Korea. A volume of fluid method, used in computational fluid dynamics, was adopted to simulate the process of coal ash injection into mine cavities. The difference in the filling efficiency of coal ash versus water using both upper and lower injection points was also investigated. Results show that use of a lower injection point more stably packed the cavity and provided a higher density of fill than use of an upper injection point. Thus, it would be better to place the nozzle of the injection pipe near the bottom of the mine cavity, below the groundwater level.

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Abbreviations

C ε1, C ε2, C ε3, C ε4 :

Coefficients of turbulent dissipation rate

E i :

Total energy

f i :

Body force vector

(F int ) i :

Internal forces (such as solid pressure force between particles)

g :

Gravity acceleration

H i :

Total enthalpy

h i (T ij ):

Phase i enthalpy evaluated at the interface temperature T ij

k :

Turbulence kinetic energy

k eff,i :

Effective thermal conductivity

M i :

Interphase momentum transfer per unit volume

m ij :

Mass transfer rate from phase j to phase i (m ij ≥ 0)

m ji :

Mass transfer rate from phase i to phase j (m ji ≥ 0)

p :

Pressure, assumed to be equal in both phases

Q ij :

Interphase heat transfer rate from phase j to phase i

Q i ij :

Heat transfer rate from phase pair interface (ij) to phase i

S u,i :

Energy source

S i a :

Phase mass source term

S i v :

Phase momentum source term

T i :

Viscous stress tensor

T i :

Temperature of phase i

u i :

Fluctuant fluid velocity of i (i = x)

u j :

Fluctuant fluid velocity of j (j = y)

v i :

Velocity of phase i

v g :

Grid velocity

α i :

Volume fraction of phase i

ε :

Turbulence dissipation rate

μ t :

Turbulence viscosity

ρ i :

Density of phase i

ρ a :

Density of air

ρ w :

Density of water

ρ c :

Density of coal ash

σ k :

Prandlt number of turbulence kinetic energy

σ ε :

Prandlt number of turbulence dissipation rate

τ i and τ i t :

Molecular and turbulent stresses, respectively

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Correspondence to Jung-Woo Cho.

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Song, CH., Cho, MG., Park, JY. et al. Computational fluid dynamics simulation of coal ash filling in underground mine cavity. Int. J. Precis. Eng. Manuf. 16, 1543–1549 (2015). https://doi.org/10.1007/s12541-015-0204-0

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  • DOI: https://doi.org/10.1007/s12541-015-0204-0

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