# Orifice Gravitational Constant

on . Posted in Flow Instrument

## Orifice gravitational constant formula

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

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

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

$$\large{ A_0 = \frac{ Q }{ C_d \; \sqrt{ 2 \; G \; h } } }$$

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

### Solve for G

 orifice flow rate, Q orifice area, Ao orifice discharge coefficient, Cd orifice center of head, h

### Solve for Q

 orifice area, Ao orifice discharge coefficient, Cd orifice gravitational constant, G orifice center of head, h

### Solve for Cd

 orifice flow rate, Q orifice area, Ao orifice gravitational constant, G orifice center of head,h

### Solve for Ao

 orifice flow rate, Q orifice discharge coefficient, Cd orifice gravitational constant, G orifice center of head, h

### Solve for h

 orifice flow rate, Q orifice area, Ao orifice discharge coefficient, Cd orifice gravitational constant, G

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