Venturi Meter Calculator
Calculate flow velocity in a Venturi meter from the pressure difference: v1 = sqrt(2 * dP / (rho * ((A1/A2)^2 - 1))).
Velocity at Wide Section
1.8257 m/s
Velocity at Wide Section vs Pressure Difference
Fórmula
## Venturi Meter A Venturi meter measures flow rate by measuring the pressure drop in a constriction. ### Formula From Bernoulli + continuity (A1 v1 = A2 v2): **v1 = sqrt(2 dP / (rho ((A1/A2)^2 - 1)))** The flow rate is Q = A1 * v1.
Ejemplo Resuelto
Water, A1 = 0.01 m2, A2 = 0.005 m2, dP = 5000 Pa.
- 01(A1/A2)^2 = (0.01/0.005)^2 = 4
- 02v1 = sqrt(2 * 5000 / (1000 * 3))
- 03v1 = sqrt(10000 / 3000)
- 04v1 = sqrt(3.333) = 1.826 m/s
- 05Q = 0.01 * 1.826 = 0.01826 m3/s
Preguntas Frecuentes
Why is a Venturi meter preferred over an orifice plate?
A Venturi has lower permanent pressure loss because the gradual expansion recovers most of the pressure. Orifice plates are cheaper but waste more energy.
Does a Venturi meter need calibration?
A discharge coefficient (typically 0.98 for well-made Venturis) corrects for small viscous and geometry effects. In theory it can be calculated from first principles.
What fluids can be measured?
Any incompressible fluid: water, oil, chemicals. For gases at low Mach numbers, it also works with a compressibility correction.
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