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13th United States/North American Mine Ventilation Symposium, 2010 Hardcastle & McKinnon (Eds.) Equivalent roughness for pressure drop calculations in mine ventilation C. Montecinos SKM Chile, Santiago, Chile K. Wallace, Jr. Mine Ventilation Services, Inc., Clovis, California, USA ABSTRACT: The generalized procedure for the calculation of the pressure drop along tunnels is by using Atkinson s equation. The friction factor in Atkinson s equation is determined from measured or computed values of airway dimensions and tunnel interior finishing according to mining method and ground support type. This paper re-visits the friction factor according to Colebrook s relationship and the darcy -Weisbach equation, which are widely used in mechanical engineering.

paper re-visits the friction factor according to Colebrook´s relationship and the Darcy-Weisbach equation, which are widely used in mechanical engineering. This method of calculating the friction has the advantage of a more

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