Table 6 Friction factor at different flow velocities.

From: Calculation model for ventilation friction resistance coefficient by surrounding rock roughness distribution characteristics of mine tunnel

Velocity/ m/s

P1/Pa

P2/Pa

\(\alpha\)

\(\alpha ^{\prime}\)

\(\delta\) (%)

0.25

0.0375

0.03587

0.00259

0.00253

2.31

1

0.600

0.5744

0.00254

0.00253

2.36

1.5

1.35

1.2918

0.00256

0.00253

1.21

2

2.412

2.3026

0.00250

0.00253

1.18

Back to article page