Strouhal number (In metrology)
In dimensional analysis, the Strouhal number is a dimensionless number describing oscillating flow mechanisms.
In metrrology, specifically axial-flow turbine meters, the Strouhal number is used in combination with the Roshko number to give a correlation between flow rate and frequency.
|St||Strouhal number (In metrology) (dimensionless)|
|f||Meter frequency (dimensionless)|
|U||Flow rate (dimensionless)|
|C||Linear coefficient of expansion for the meter housing material (dimensionless)|