Original scientific paper

THE IMPACT OF WALL ROUGHNESS OF THE UNDERGROUND AIRWAYS ON THE VALUE OF HYDRAULIC FRICTION FACTOR

Vladimir Rendulić

Abstract

The studies of turbulent flows in round pipes resulted in many hydraulic formulas up to these days, which can also serve in projecting to calculate the resistance to the air flow in underground openings. The report discusses the way of establishing the hydraulic friction factor of untimbered underground workings when the value of equivalent roughness is obtained by measuring the ventilation parameters in a similar working of some other mine. A double reticular nomogram has been constructed for the fast determination of friction coefficient from the known roughness of an underground working.

Keywords

Mine ventilation; Underground openings; Air current; Hydraulic diameter; Roughness; Smoothness; Friction factor

Hrčak ID:

24733

URI

https://hrcak.srce.hr/24733

Publication date:

4.12.1991.

Article data in other languages: croatian

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