Colebrook Friction Loss Formula for Round Ducts In the region of laminar flow (Reynolds numbers less than 2300),the friction factor is a function of Reynolds number only. For completely turbulent flow (fully rough), the friction factor depends on duct surface roughness and internal protuberances (...
In the next example, the effect of spacing between busbars in a three-phase busduct with round conductors is considered for typical wire materials and heat transfer coefficients. Two typical materials were taken into account: copper ( σ = 55 MS / m , μ r = 1 , λ = 360 W / mK )...