Darcy Friction Factor Calculator
Darcy Friction Factor Calculator . For rectangular pipes (ducts), d=4a/p is known as the hydraulic diameter. Many of these types of calculations require a graphical and/or iterative solution. Head Loss (Darcy Weisbach) Calculator from ncalculators.com By definition it is four times larger than the fanning friction factor. F = 0.0055 ( 1 + (2 * 10 4 * k/d + 10 6 /re) 1/3) this approximation is valid for flow regimes where reynold's number is between 4,000 and 5*10 8, and pipes with a k/d ratio less than 0.01. Δ p f p = f d 1 2 l d i ρ w 2 = 17171 p a = 0.172 b a r.