Orifice Discharge Coefficient

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

 

Orifice Discharge Coefficient formula
\(\large{ C_d =   \frac { Q }  { A_o \; \sqrt { 2 \; G \; h }     }   }\)
Symbol	English	Metric
\(\large{ C_d  }\) = orifice discharge coefficient	\(\large{ dimensionless }\)
\(\large{ A_o }\) = orifice area	\(\large{ in^2 }\)	\(\large{ mm^2 }\)
\(\large{ h }\) = orifice center of head	\(\large{ in }\)	\(\large{ mm }\)
\(\large{ Q }\) = orifice flow rate	\(\large{\frac{ft^3}{sec}}\)	\(\large{\frac{m^3}{s}}\)
\(\large{ G }\) = orifice gravitational constant	\(\large{\frac{lbf-ft^2}{lbm^2}}\)	\(\large{\frac{N - m^2}{kg^2}}\)