For turbulent flow (NRe > 2100) of low viscosity fluid (? > 20cp) in steel pipes, the optimum inside pipe diameter is given by(where, Q = fluid flow rate, ft3/sec, ? = fluid density, lb/ft3 ? = fluid viscosity, centipoise Di = optimum inside pipe diameter, inches) ?

A. Di, opt = 4.7 Q0.36. ?3.2?0.13

B. Di, opt = 3.9 Q0.45. ?0.95

C. Di, opt = 3.9 Q0.45 ?0.13

D. Di, opt = 3 Q0.36. ?0.88

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