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Quantitative dimensionless measure
of the friction forces between
fluid pipe flow and inner
pipe walls based on
Darcy–Weisbach equation.
It depends on Reynolds number and roughness (see Fig. 1): LaTeX Math Inline |
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body | --uriencoded--f =f(%7B\rm Re%7D, \, \epsilon) |
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In engineering practice one can use either Moody Chart or Darcy friction factor @model to estimate the actual value of Darcy friction factor.
Darcy friction factor
takes only positive values but has singularity at zero flow velocity: LaTeX Math Inline |
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body | --uriencoded--%7B\rm Re%7D \rightarrow 0 \Rightarrow f \rightarrow \infty |
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which may cause computational challenges.
Using Reduced Friction Factor
LaTeX Math Inline |
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body | --uriencoded--\Phi = f \cdot %7B\rm Re%7D / 64 |
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instead can help in computations as it stays finite for all finite values of Reynolds number . See also
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Physics / Fluid Dynamics / Pipe Flow Dynamics / Darcy–Weisbach equation
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