Pinhoa F.T., Piqueirob F.M., Proençab M.F., Santosc A.M. Power and Mean Flow Characteristics in Mixing Vessels Agitated by Hyperboloid Stirrers

The mean flow and energy consumption in vessels powered by hyperboloid stirrers was
investigated. The Newton number followed an inverse linear law for Reynolds numbers below
approximately 200, which had values more than twice higher the corresponding Newton number
for a standard Rushton turbine. At high Reynolds number flows the Power number varied
between 0.5 for a D/T= 0.78 impeller to 0.95 for a D/T= 0.24 impeller, as compared to a value
of 5 for the standard Rushton stirrer, and to values of 0.31 and 1.58 for the Chemineer and
Prochem hydrofoils.