Air Ducts - Friction Loss Diagram The chart below can be used to estimate friction loss in air ducts. The default values are for air flow 400 cfm (680 m3 /h) , duct size 8 in (200 mm) and friction loss 0.28 inH2O/100ft (2.3 Pa/m) . Download and print Air Ducts Friction Loss ...
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 (...
The value of the friction factor is usually obtained from theMoody Chart. The Moody Chart can be used to determine the friction factor based on the Reynolds number and the relative roughness. Example: Determine the friction factor (f) for fluid flow in a pipe that has a Reynolds number of ...