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THE IMPACT OF WALL ROUGHNESS OF THE UNDERGROUND AIRWAYS ON THE VALUE OF HYDRAULIC FRICTION FACTOR
Vladimir Rendulić
Sažetak
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.
Ključne riječi
Mine ventilation; Underground openings; Air current; Hydraulic diameter; Roughness; Smoothness; Friction factor
Hrčak ID:
24733
URI
Datum izdavanja:
4.12.1991.
Posjeta: 1.800 *