For laminar flow (NRe < 2100) in steel pipe, the optimum inside pipe diameter is given by____________________?

A. Di, opt = 3 Q0.36 ?1.86 ?0.08

B. Di, opt = 3.9 Q0.45 ?0.23

C. Di, opt = 3 Q0.36 ?0.18

D. Di, opt = 7.6 Q0.36 ?0.9

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