Moody Diagram

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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 - 2300 < Re < 4000 - the flow varies between laminar and turbulent flow and the friction coefiicient is not possible to determine. The friction factor can usually be interpolated between the laminar value at Re = 2300 and the turbulent value at Re = 4000.

A very nice Moody diagram in pdf-format from Glasgow College of Nautical Studies can be found here:

• Moody Diagram

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Related Topics

• Fluid Mechanics - The study of fluids - liquids and gases. Involves various properties of the fluid, such as velocity, pressure, density and temperature, as functions of space and time.

Related Documents

• Colebrook Equation - Calculate friction loss coefficients in pipes, tubes and ducts
• Major loss in Ducts, Tubes and Pipes - Major loss - head loss or pressure loss - due to friction in ducts, pipes and tubes