# Orifice Flow Rate

Written by Jerry Ratzlaff on . Posted in Flow Instrument

Orifice flow rate is the amount of fluid that flows in a given time.

## formula

$$Q = C_d A_o \sqrt { 2GH }$$

Where:

$$Q$$ = flow rate

$$C_d$$ = discharge coefficient

$$A_o$$ = orifice area

$$G$$ = gravitational constant

$$H$$ = center line head

Solve for:

$$G = \frac { \left ( \frac { Q } { C_d A_o } \right) ^2 } { 2H }$$

$$H = \frac { \left ( \frac { Q } { C_d A_o } \right) ^2 } { 2G }$$