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# Vortex Flowmeters - Shedding Frequency vs. Volume Flow Rate

### Vortex Shedding Frequency

The vortex shedding frequency around a bluff body can be calculated as

f = Sr v / d                                             (1)

where

f = vortex shedding frequency (Hz)

Sr = Strouhal number (dimensionless)

v = flow velocity (m/s)

d = bluff body diameter

### Volumetric Flowrate

The volumetric flowrate from the shredding frequency can be calculated as

q = A f / k                                      (2)

where

q = volumetric flowrate (m3/s)

A = cross sectional area of the vortex orifice (m2)

k = a constant for all fluids given design of meter

## Related Topics

### • Flow Measurements

Flow metering principles - Orifice, Venturi, Flow Nozzles, Pitot Tubes, Target, Variable Area, Positive Displacement, Turbine, Vortex, Electromagnetic, Ultrasonic Doppler, Ultrasonic Time-of-travel, Mass Coriolis, Mass Thermal, Weir V-notch, Flume Parshall and Sluice Gate flow meters and more.

## Related Documents

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### Fluid Flowmeters - Comparing Types

An introduction to the different types of fluid flowmeters - Orifices, Venturies, Nozzles, Rotameters, Pitot Tubes, Calorimetrics, Turbine, Vortex, Electromagnetic, Doppler, Ultrasonic, Thermal, Coriolis.

### Strouhal Number

Introduction to the Strouhal Number

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An introduction to vortex flowmeters.

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