Orifice Area
Orifice area refers to the area cross-section of an orifice, which is a small opening or hole through which fluid flows. The orifice area is an important parameter in fluid dynamics and flow calculations, particularly in applications such as pipes, nozzles, and valves.
- Geometric Orifice Area (GOA) - The orifice opening
- Effective Orifice Area (EOA) - The minimal cross-section area of the downstream jet.
- Contraction Coefficient (\(C_c\)) - 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 (\(C_d\)) - The ratio of actual flow to ideal flow or \(C_d = \frac{Q_a}{Q_i}\)
Orifice Area formula |
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\(\large{ A_0 = \frac{ Q }{ C_d \; \sqrt{ 2 \; G \; h } } }\) (Orifice Area) \(\large{ Q = A_o \; C_d \; \sqrt{ 2 \; G \; h } }\) \(\large{ C_d = \frac{ Q }{ A_o \; \sqrt{ 2 \; G \; h } } }\) \(\large{ G = \frac{ \left( \frac{ Q }{ C_d \; A_o } \right)^2 }{ 2 \; h } }\) \(\large{ h = \frac{ \left( \frac{ Q }{ A_o \; C_d } \right)^2 }{ 2 \; G } }\) |
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Solve for Ao
Solve for Q
Solve for Cd
Solve for G
Solve for h
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| Symbol | English | Metric |
| \(\large{ A_o }\) = orifice area | \(\large{ in^2 }\) | \(\large{ mm^2 }\) |
| \(\large{ Q }\) = orifice flow rate | \(\large{\frac{ft^3}{sec}}\) | \(\large{\frac{m^3}{s}}\) |
| \(\large{ C_d }\) = orifice discharge coefficient | \(\large{ dimensionless }\) | |
| \(\large{ G }\) = orifice gravitational constant | \(\large{\frac{lbf-ft^2}{lbm^2}}\) | \(\large{\frac{N - m^2}{kg^2}}\) |
| \(\large{ h }\) = orifice center of head | \(\large{ in }\) | \(\large{ mm }\) |
Tags: Area Orifice and Nozzle