churchill1 - Churchill (1973) friction factor

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3.2.14 churchill1 - Churchill (1973) friction factor

f = churchill1(d,e,re)

Calculate the Churchill approximation of the Colebrook-White equation.

Arguments

d: Pipe internal diameter ( $m$ ).
e: Pipe effective roughness $ε$ .
re: Reynolds number

Returns Darcy friction factor $f$ , dimensionless.

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