Vortex Shedding Frequency and Volume Flow Rate

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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

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Related Topics

• Fluid Flow Meters - Flow metering basics - 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

• Strouhal Number - An introduction to and a definition of the Strouhal Number
• Types of Fluid Flow Meters - An introduction to different types of fluid flowmeters - Orifices, Venturies, Nozzles, Rotameters, Pitot Tubes, Calorimetrics, Turbine, Vortex, Electromagnetic, Doppler, Ultrasonic, Thermal, Coriolis
• Vortex Flowmeters - a Tutorial - An introduction to vortex flowmeters