Orifice Flow Calculator
Calculate flow rate through a sharp-edged orifice plate from differential pressure.
Vazão Volumétrica
0.00770 m^3/s
Volumetric Flow Rate vs Discharge Coefficient (Cd)
Formula
## Orifice Plate Flow Measurement An orifice plate restricts flow in a pipe, creating a measurable pressure difference proportional to flow rate. ### Formula **Q = Cd A sqrt(2 delta_P / rho)** where Cd is the discharge coefficient (typically 0.60-0.65 for sharp-edged orifices), A is the orifice area, delta_P is the measured differential pressure, and rho is fluid density.
Exemplo Resolvido
A 50 mm orifice in a water pipe with 20 kPa differential pressure, Cd = 0.62.
- 01A = pi x 0.05^2 / 4 = 0.001963 m^2
- 02sqrt(2 x 20000 / 1000) = sqrt(40) = 6.325 m/s
- 03Q = 0.62 x 0.001963 x 6.325 = 0.00770 m^3/s = 7.70 L/s
Perguntas Frequentes
What affects the discharge coefficient?
Cd depends on the orifice edge sharpness, the ratio of orifice to pipe diameter (beta ratio), Reynolds number, and upstream flow conditions. Sharp-edged plates typically have Cd = 0.60-0.65.
How is the orifice plate installed?
The plate is clamped between pipe flanges with pressure taps upstream and downstream. Standard tap locations include corner taps, D and D/2 taps, and flange taps, each with slightly different Cd values.
What are the disadvantages of orifice plates?
They cause a permanent pressure loss (typically 40-90% of the measured differential). For applications where energy loss matters, Venturi meters or flow nozzles are more efficient alternatives.
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