jain - Jain friction factor

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3.2.16 jain - Jain friction factor

f = jain(d,e,re)

Calculate the Jain 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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