Resistance Coefficient

Written by Jerry Ratzlaff on . Posted in Dimensionless Numbers

Resistance coefficient, abbreviated as K, a dimensionless number, is how much resistance to the flow an obstacle has.  This is the opposite of flow coefficient which is how much flow capacity an obstacle allows.


Resistance Coefficient formula

\(\large{ K =  f_d \; \frac {l} {d} }\) 
Symbol English Metric
\(\large{ K }\) = resistance coefficient \(\large{dimensionless}\)   
\(\large{ f_d }\) = Darcy friction factor \(\large{dimensionless}\)   
\(\large{ d }\) = inside diameter of pipe \(\large{in}\) \(\large{mm}\)
\(\large{ l }\) = lenght of pipe \(\large{ft}\) \(\large{m}\)
 \(\large{ i }\) = \(\large{ \frac{l}{d} }\) = equivalent length of the obstruction \(\large{dimensionless}\)   


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Tags: Coefficient Equations Orifice and Nozzle Equations