fang - Fang friction factor

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3.2.30 fang - Fang friction factor

f = fang(d,e,re)

Calculate the Fang 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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