TY - JOUR N2 - This paper extends knowledge about flow in an agitated batch with pitched blade multi-stage impellers. Effects of various geometrical parameters (blade number, distance between impellers) of pitched blade multi-stage impellers on pumping ability have been investigated. Axial velocity profiles were measured by LDA (Laser Doppler Anemometry). Axial pumping capacities were obtained by integration of measured axial velocity profiles in outflow from impellers. Main attention was focused on the effect of the distance between impellers in multi-stage configurations, on their pumping capacity and flow in the mixing bath in comparison with an independently operating pitched blade impeller with the same geometry. In case of a relatively close distance between impellers H3/d = 0.5 - 0.75, the multi-stage impeller creates only one circulation loop and the impellers itself behave identically as pumps in series. However for relative higher distance of impellers than H3/d = 1.25, the multi-stage impeller creates two separated circulation loops. L1 - http://journals.pan.pl/Content/84924/PDF/04-paper-Jirout.pdf L2 - http://journals.pan.pl/Content/84924 PY - 2014 IS - No 1 March EP - 53 DO - 10.2478/cpe-2014-0004 KW - pitched blade impeller KW - multi-stage impeller KW - impeller pumping capacity KW - velocity profile KW - laser Doppler anemometry A1 - Jirout, Tomáš PB - Polish Academy of Sciences Committee of Chemical and Process Engineering DA - 2014 T1 - Pumping Capacity of Pitched Blade Multi-Stage Impellers SP - 47 UR - http://journals.pan.pl/dlibra/publication/edition/84924 T2 - Chemical and Process Engineering ER -