A Rushton turbine has 20 cm impeller diameter and 200 rpm stirrer speed. Air flow into the tank is .2 m³/min. Find the dimensionless Froude number, to two decimals.
For an agitated tank,$Fr=N^2D/g$ with N in revolutions per second. N=200/60=3.3333 s⁻¹,so Fr=(3.3333)²(.20)/9.81=.226526,or **.23**. Aeration flow would enter the flow number, not this Froude number.
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