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# Vortex Flowmeters - Shedding Frequency vs. Volume Flow Rate

## The vortex shedding frequency created around a bluff body and 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

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## Related Documents

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

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## Citation

• The Engineering ToolBox (2008). Vortex Flowmeters - Shedding Frequency vs. Volume Flow Rate. [online] Available at: https://www.engineeringtoolbox.com/vortex-shedding-frequency-d_1065.html [Accessed Day Month Year].

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6.3.17

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