Surface Environment, Mine Ventilation and Underground Hazards · Mine Ventilation · 1 mark · Numerical answer
Increase roadway resistance by 1.5 N s²/m⁸ using a regulator. Find its opening area in m² to two decimals, using the conventional equivalent-orifice relation.
The conventional mine equivalent-orifice formula is A = 1.2Q/√p, with Q in m³/s and p in Pa. Since p = RQ², it becomes A = 1.2/√R. For R = 1.5, A = 0.979796 m², or 0.98 m². The coefficient 1.2 is outside the square root.
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