online_explicit_darcy_weisbach:  Explicit equation for Darcy-Weisbach friction factor f

Comparison of laminar and turbulent flow
    


                  0.25
f = ________________________________________
     {log[(ks/D)/3.7 + 5.74/Re0.9]}2


INPUT DATA:

Relative roughness ks /D :    

    [Restricted to:  0.00001 < ks /D  < 0.02]  

Reynolds number Re :    

    [Restricted to:  4000 < Re < 100,000,000]  

OUTPUT:

f  =  0  


            

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