Pumping characteristics of a screw agitator in a tube

Most information on pumping characteristics that is available in the literature is limited either to the turbulent region (centrifugal pumps) or to the creeping flow regime (screws). The aim of this paper is to investigate the effect of the Reynolds number on the pumping characteristics of agitators. The results of measurements using the new dynamic method are illustrated for a screw agitator in a tube. The characteristics, in the form of the dependence of the dimensionless specific energy on the dimensionless pumping capacity, were obtained for a wide range of Reynolds number values. The experimental creeping flow characteristic was compared with the theoretical prediction.