Free Venturi Meter Calculator
Determine the flow rate through a Venturi meter from upstream and throat dimensions and pressure difference.
Volumetric Flow Rate
10.89 L/s
Volumetric Flow Rate vs Discharge Coefficient (Cd)
Venturi Meter Flow Measurement
A Venturi meter uses a converging-diverging section to measure flow with minimal permanent pressure loss.
Formula
Q = Cd A2 sqrt(2 delta_P / (rho (1 - beta^4)))
where A2 is the throat area, beta = D2/D1 is the diameter ratio, and the (1 - beta^4) term accounts for the velocity change between upstream and throat. Cd for Venturi meters is typically 0.95-0.99.
Example Calculation
A Venturi with 100 mm upstream and 50 mm throat, 15 kPa differential, water.
- 01beta = 50/100 = 0.5, beta^4 = 0.0625
- 02A2 = pi x 0.05^2 / 4 = 0.001963 m^2
- 03sqrt(2 x 15000 / (1000 x (1 - 0.0625))) = sqrt(30000/937.5) = sqrt(32) = 5.657 m/s
- 04Q = 0.98 x 0.001963 x 5.657 = 0.01088 m^3/s = 10.88 L/s
Frequently Asked Questions
Learn More
Beam Stress Calculation Guide: From Theory to Practice
Learn how to calculate beam stress step by step. Covers bending stress, shear stress, the flexure formula, stress distributions, and practical design checks for structural beams.