40.6: Smooth Pipes and Turbulent Flow

40.6 Smooth Pipes and Turbulent Flow

Another simple relationship was developed by Blasius for flow in smooth pipes at Reynolds numbers between 2.5 10 ³ and 1 10 ⁵. In this region the friction factor ? for smooth circular cross-section pipes approximates to

()

which gives us

()

All the symbol units used here are the same as in preceding sections, and ? P _f is once again expressed as poundal/ft ², or lb (mass) ft ^-1. s ^-2.

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