# 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.

### Orifice Flow Rate Formula

$$\large{ Q = C_d A_o \sqrt { 2Gh } }$$

Where:

$$\large{ Q }$$ = flow rate

$$\large{ C_d }$$ = discharge coefficient

$$\large{ G }$$ = gravitational constant

$$\large{ h }$$ = center of head

$$\large{ A_o }$$ = orifice area

Solve for:

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

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

Tags: Equations for Flow