For laminar flow ( N Re < 2100) in steel pipe, the optimum inside pipe – McqOptions

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1.	For laminar flow ( N Re < 2100) in steel pipe, the optimum inside pipe diameter is given by
A.	D i, opt = 3 Q 0.36 ? 0.18
B.	D i, opt = 3.9 Q 0.45 . ? 0.23
C.	D i, opt = 7.6 Q 0.36 . ? 0.9
D.	D i, opt = 3 Q 0.36 . ? 1.86 ? 0.08
Answer» B. D i, opt = 3.9 Q 0.45 . ? 0.23

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