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It depends on Reynolds number
and roughness LaTeX Math Inline body \rm Re
(see Fig. 1).LaTeX Math Inline body \epsilon
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Fig. 1. Schematic chart showing how Darcy friction factor depends on Reynolds number
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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 .
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[ Darcy friction factor @model ] [ Moody Chart ]
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