Determination of Airflow Distributions in ...

The assumption on the design for the mine airflows is that the frictional factor for the entry is 0.0028 Ns2/m4 (for smooth pipe), the entry cross section is 0.899 m2, the entry perimeter is 3.36 m, the modelled pillar is maintained at a fixed length and the diameter of the duct 1.07 m while other parameters like the air volume, length of road way and the pillar width are varied. The design for the pre-ventilation system of the Okaba Coal deposit requires 145 m3/s of air with a main fan pressure of 2.73 kPa and four booster fans of air volume; 110 m3/s, 125 m3/s, 95 m3/s, 105 m3/s whose fan pressure are 0.63 kPa, 0.87 kPa, 0.47 kPa, 0.50 kPa respectively, with exhaust fan of 70 m3/s at fan pressure of 0.38 kPa which is required to ventilate the mine.