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Numerical Simulation of Ventilation Air Flow in Underground Mine Workings

Numerical Simulation of Ventilation Air Flow in Underground Mine Workings. S.M. Aminossadati & K. Hooman. Situation.

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Numerical Simulation of Ventilation Air Flow in Underground Mine Workings

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  1. Numerical Simulation of Ventilation Air Flow in Underground Mine Workings S.M. Aminossadati & K. Hooman

  2. Situation Brattice sail is a thin, light-weight, fire resistant sheet which can be hung against the ceiling, across tunnel openings and extended into cross-cuts to divert the airflow into these regions.

  3. Objectives Flow Field versus Air Velocity and Length of Brattice

  4. variable of interest instantaneous air density diffusive coefficient source rate per unit volume Governing Equation transient term convective term diffusive term source term

  5. Grid Independency GRID 93715 Cells GRID 18942 Cells

  6. Results  Re=0.3106 No Brattice L=3H U V

  7. Results  Re=0.3106 h/H=1.5 h L=3H U V

  8. Results  Re=0.3106 h/H=2.5 h L=3H U V

  9. Results  Re=0.3106 h/H=2.75 h L=3H U V

  10. Re=0.3106 h/H=2.75 X-Velocity Profile

  11. Re=0.3106 h/H=2.75 Y-Velocity Profile

  12. (B) (C) (D) Y-Velocity at Brattice Exit

  13. Maximum Y-Velocity

  14. Mass Flow Rate Ratio

  15. Conclusions • Minor dependency of the streamlines on the magnitude of Reynolds number • With no brattice, the streamlines are weak in the cross-cut • Use of a brattice increases the airflow into the cross-cut • Y-velocity in the cross-cut behaved differently at different brattice lengths • Higher brattice lengths showed a higher maximum velocity near the right wall of the cross-cut and therefore better ventilation Future Studies • Distance of brattice with the wall • Diesel, Gas and Dust Emissions • Heat Sources • Three-dimensional simulation

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