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| ![]() | ![]() | Darcy-Weisbach formula
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![]() | ![]() | ![]() | ![]() Only either the velocity or the discharge rate needs to be entered. The Darcy friction factor f is also known as the "flow coefficient" λ or the Moody friction factor, and is 4x the Fanning friction factor. It is dependant on many factors such as the pipe material, shape, and fluid velocity. Therefore, it must be known or calculated for each specific use. For laminar flow in a circular pipe, it is 64/Re. Other calcs designed for specific conditions are available, which do not have the need for a known value of f. | ![]() | ||||||
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