Turbulent flow smooth pipes and

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

All the symbol units used here are the same as in preceding sections, and APfis once again expressed as poundal/ft, or lb (mass) fH- s.  

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