Orifice Area
Geometric orifice area (GOA) is the orifice opening- Effective orifice area (EOA) is the minimal cross-section area of the downstream jet.
- Contraction coefficient (\(C_c\)) is the ratio of the area measured at the vena contracta (EOA), to the area of the orifice (GOA) or \(C_c = \frac{EOA}{GOA}\)
- Discharge coefficient (\(C_d\)) is the ratio of actual flow to ideal flow or \(C_d = \frac{Q_a}{Q_i}\)
Orifice Area formula
| \(\large{ A_0 = \frac{ Q }{ C_d \; \sqrt{ 2 \; g \; H } } }\) |
Where:
\(\large{ A_o }\) = orifice area
\(\large{ h }\) = orifice center of head
\(\large{ C_d }\) = orifice discharge coefficient
\(\large{ Q }\) = orifice flow rate
\(\large{ G }\) = orifice gravitational constant