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

$$\large{ Q = C_d \; A_o \; \sqrt { 2 \; G \; h } }$$

Where:

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

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

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

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

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

Solve for:

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

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

$$\large{ A_0 = \frac{ Q }{ C_d \; \sqrt{ 2 \; g \; H } } }$$

$$\large{ C_d = \frac{ Q }{ A_0 \; \sqrt{ 2 \; g \; H } } }$$