A pressure quantity survey was conducted at two stations in a drift dipping at 12°. The following information was recorded:

STATION 1

STATION 2

Dimensions of airway

2.4 m x 5.5 m

2.5 m x 5.5 m

Velocity

3.20 m/s

3.07 m/s

Pressure

99750 N/m²

98750 N/m²

Distance between stations, measured down the drift: 800 m

Taking the density of air as 1.2 kg/m³, calculate the frictional pressure drop along the drift and hence the average friction factor. (10 marks)

Question

A pressure quantity survey was conducted at two stations in a drift dipping at 12°. The following information was recorded:

Distance between stations, measured down the drift: 800 m

Taking the density of air as 1.2 kg/m³, calculate the frictional pressure drop along the drift and hence the average friction factor. (10 marks)

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