Vortex Flowmeters - Shedding Frequency vs. Volume Flow Rate
The vortex shedding frequency created around a bluff body and 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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