Collect. Czech. Chem. Commun. 1997, 62, 1871-1878

Influence of Geometry on Pumping Characteristics of Screw Agitators in a Tube

Libor Sedláček and František Rieger

Department of Chemical and Food Process Equipment Design, Czech Technical University, 166 07 Prague 6, Czech Republic


The pumping characteristics of screw agitators in tubes were measured using a new dynamic method. Two inductive sensors record the difference of liquid surfaces in the tank while the liquid is pumped out. The characteristics in the form of dependence of the dimensionless specific energy on the dimensionless pumping capacity were obtained over a wide range of Reynolds number values. Screw agitators with different root diameter, pitch and number of flights were used in the experiments. The influence of above-mentioned geometrical parameters on pumping characteristics is discussed.

Keywords: Screw agitator; Draught tube; Pumping characteristics.