What Is the Venturi Meter Flow Rate Calculator?
A Venturi meter consists of a convergent inlet cone, a cylindrical throat, and a gradual divergent diffuser cone.
The gradual diffuser minimizes boundary layer separation, recovering 85–90% of the constricted pressure drop.
How Does the Venturi Meter Flow Rate Calculator Work?
Fluid accelerates into the throat, causing static pressure to drop according to Bernoulli’s principle.
Measuring the pressure differential between inlet and throat yields the exact volumetric flow rate.
Venturi Meter Flow Rate Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
Bernoulli energy conservation with continuity velocity of approach factor.
How to Use the Venturi Meter Flow Rate Calculator
- Input inlet and throat diameters, differential pressure in kPa, fluid density, and discharge coefficient.
- Review flow rate in L/s and m³/s, and throat velocity.
Step-by-Step Example Calculation
Water Treatment Flow Monitoring
Input Values:
Understanding Your Result
High discharge coefficients (Cd ≈ 0.98) reflect minimal frictional energy loss across the meter.
Factors That Affect the Result
- Upstream flow disturbances (elbows, valves) require flow straighteners or minimum straight pipe runs (10–20 diameters).
When Should You Use This Calculator?
- Water utility metering, petrochemical refining, slurry transport, and airflow measurements.
Assumptions & Limitations
- Assumes steady, incompressible, single-phase fluid flow.
Frequently Asked Questions
Calculation Accuracy & Reference Note
Standard ISO 5167 measurement of fluid flow by means of pressure differential devices.