Abstract
The minimum power of impeller required for complete suspension of solid particles, based on Zwietering's criterion, was measured for single and twin impeller systems. The effects of the configuration of vessel and the number of impellers on the minimum required power were examined.The minimum required power per unit liquid volume Pfv for a single impeller system increased gradually as the length ratio of long side to short side A/B incresed over 1.5 Pfv for a twin impeller system remained nearly constant at a lower value than that of a single impeller system in the range of A/B=1.52.25.The Pfv of a pitched-blade turbine was below 1 / 2 of the value of a flat-blade disc turbine under the same conditions and was independent of the rotational direction of each impeller.
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