Delta paddle mixing impeller--some hydrodynamic studies

Local measurements of the pressure difference across a 20 cm diameter delta impeller blade, and the pressure on the blade, have been carried out using a rotating manometer mounted on the shaft. The impeller was driven at speeds between 1.33 and 3.67 r.p.s. in a 30 cm square tank containing 27 l of water. The velocity field has been observed using cotton streamers taped to the blade, and by photographing dispersions of particles. Flow enters the …