Vortex Shedding Frequency
The vortex shedding frequency around a bluff body can be calculated as
f = Sr v / d (1)
f = vortex shedding frequency (Hz)
Sr = Strouhal number (dimensionless)
v = flow velocity (m/s)
d = bluff body diameter
The volumetric flowrate from the shredding frequency can be calculated as
q = A f / k (2)
q = volumetric flowrate (m3/s)
A = cross sectional area of the vortex orifice (m2)
k = a constant for all fluids given design of meter
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.
Calculate the discharge length from the open end of a partially filled horizontal pipe.
A limited comparison of flowmeter principles - regarding service, rangeability, pressure loss, typical accuracy, upstream pipe diameters, viscosity and relative costs.
An introduction to the different types of fluid flowmeters - Orifices, Venturies, Nozzles, Rotameters, Pitot Tubes, Calorimetrics, Turbine, Vortex, Electromagnetic, Doppler, Ultrasonic, Thermal, Coriolis.
Introduction to the Strouhal Number
An introduction to vortex flowmeters.