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
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
-
California Pipe Flow Metering Method
Calculate the discharge length from the open end of a partially filled horizontal pipe. -
Comparing Flowmeters
A limited comparison of flowmeter principles - regarding service, rangeability, pressure loss, typical accuracy, upstream pipe diameters, viscosity and relative costs. -
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 -
Vortex Flowmeters
An introduction to vortex flowmeters.
