The discharge (Q) through an orifice meter is given by __________:
(Where a1 and a2 are the areas of the pipe and orifice, Cd is the coefficient of discharge and h is the difference of pressure head in the orifice meter)
1
\(Q = {C_d}\frac{{{a_1} - {a_2}}}{{\sqrt {a_1^2 - a_2^2} }}\sqrt {2gh} \)
2
\(Q = {C_d}\frac{{{a_1}/{a_2}}}{{\sqrt {a_1^2 - a_2^2} }}\sqrt {2gh} \)
3
\(Q = {C_d}\frac{{{a_1} + {a_2}}}{{\sqrt {a_1^2 - a_2^2} }}\sqrt {2gh} \)
4
\(Q = {C_d}\frac{{{a_1}{a_2}}}{{\sqrt {a_1^2 - a_2^2} }}\sqrt {2gh} \)