Orifice Gravitational Constant

Written by Jerry Ratzlaff on . Posted in Flow Instrument

orifice liquid 1Orifice gravitational constant formula

\(\large{ G =  \frac{  \left (  \frac{ Q }{ C_d \; A_o } \right) ^2  }{ 2 \; h  }   }\)   

Where:

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

Solve for:

\(\large{ C_d =   \frac { Q }  { A_o \; \sqrt { 2 \; G \; h }     }   }\)  

 

Piping Designer Logo Slide 1

Tags: Equations for Constant Equations for Orifice and Nozzle