Discharge Coefficient

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Discharge coefficient, abbreviated as \(C_d\), also called coefficient of discharge, a dimensionless number, is the ratio of actual discharge to the theoretical discharge.


Discharge Coefficient formula

\(\large{ C_d =   \frac { \dot m_f }  {  \rho \; Q }  }\)
Symbol English Metric
\(\large{ C_d }\) = discharge coefficient \(\large{ dimensionless }\)
\(\large{ \rho }\)  (Greek symbol rho) = density of fluid \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\)
\(\large{ \dot m_f }\) = mass flow rate \(\large{\frac{lbm}{sec}}\) \(\large{\frac{kg}{s}}\)
\(\large{ Q }\) = volumetric flow rate \(\large{\frac{ft^3}{sec}}\) \(\large{\frac{m^3}{s}}\)


P D Logo 1

Tags: Coefficient Equations Flow Equations Orifice and Nozzle Equations