5.2.4 Viscosity
Practice indicates and current experiment confirms that universal calibration curves for turbine flowmeters can be constructed if calibration data are expressed dimensionlessly as:
where Ro is the Roshko number, and St is the Strouhal number, where f is the meter frequency, D is the flowmeter diameter, ν is the kinematic viscosity and is the volumetric flow rate. The kinematic viscosity of the flume water must be measured to calculate the Roshko number. Q