Power Requirements for Yield Stress Fluids in a Vessel with Forward-Reverse Rotating Impeller

Abstract The main objective of this study was to investigate an effect of forward-reverse mixing on power characteristics for yield stress fluids in a vessel stirred by turbine impeller as well as to estimate an effect of frequency of forward-reverse rotation. Experimental data show that power number was independent of oscillation frequency. Comparison of power requirements for forward-reverse and standard (unidirectional) mixing show that power number was greater for forward-reverse mixing in a vessel with pitched blade turbine PBT. For RT system there was another relation. Power number (Re 50 power requirements were greater compared to standard mixing.