Vortex flowmeters are used to measure different media; let’s analyze the results
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1. A vortex flow meter is installed in a pipeline, and three different fluids pass through it at different times; the actual volumetric flow rate is exactly the same in each case. Will the flow rate displayed by the vortex flow meter be the same? (Occurs when the Reynolds number is within the required range)
In other words, is the measurement principle of vortex streets related to the density of the medium?
f=St*v/d is related to the flow velocity and the width of the vortex generator, and has nothing to do with temperature, viscosity, or density
The calculation formula has no relation to density or viscosity, but in practice, when the viscosity exceeds a certain value, vortices can no longer be generated.
If they are all ordinary gases, the display will be the same
The effect of gaseous media is minimal, but in the case of liquid media, factors such as density, viscosity, temperature, and static pressure can affect the rate at which vortex streets are generated. It is advisable to perform separate corrections for media under different operating conditions, and then carry out compensatory calculations for the measured flow rate. As mentioned earlier by Haiyou, it seems unrelated to the density and viscosity of the medium, but that is just a surface phenomenon; although the Strouhal number is dimensionless, its actual value is determined by factors related to density and viscosity, that is, by the flow conditions of the medium. The flow state of a medium is related to many of its physical properties.