D, m

λ at different air velocities

v = 15 m/s

v = 20 m/s

v = 25 m/s

λ_b

λ_e

λ_b

λ_e

λ_b

λ_e

0.400

0.0127

0.022

0.0118

0.0206

0.007

0.019

0.355

0.0130

0.023

0.0120

0.0216

0.0115

0.020

0.315

0.0135

0.024

0.0125

0.022

0.0118

0.0216