Figure 21. Difference Between Viscosities of the Flume and Distilled Water
The kinematic viscosity of the distilled water [12] can be fitted with an uncertainty of 0.001% using a rational polynomial
22()/(1acTeTbTdT ν=++++
with coefficients: a=1.794345 cm2/s, b=0.034252 cm2/s/K , c=-0.00172 cm2/s/K, d=0.000201cm2/s/K2 and e=2.86.10-5cm2/s/K2 . In order to obtain viscosity the difference between flume and distilled water should be added. The viscosity of the flume water is measured periodically, once every 3-4 months.