# Find friction factor moody diagram

The friction factor f can be determined using the Moody diagram shown in Figure as follows: 1. For the given flow rate, liquid properties, and pipe size, calculate the Reynolds number of flow using Equation (). 2. Calculate the relative roughness (e/D) of the pipe by dividing the pipe absolute roughness by the inside diameter of the pipe. 3. Moody Diagram. The friction factor of laminar flow is independent of roughness of the pipe’s inner surface. The pipe cross-section is also important, as deviations from circular cross-section will cause secondary flows that increase the head loss. Non-circular pipes and ducts are generally treated by using the hydraulic diameter. SI based Moody Diagram. The Moody friction factor - λ (or f) - is used in the Darcy-Weisbach major loss equation. The coefficient can be estimated with the diagram below: If the flow is transient -

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Fluid Mechanics: Laminar & Turbulent Pipe Flow, The Moody Diagram (17 of 34), time: 51:35

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