When centrifugal pumps are used for pumping high-viscosity liquids, a problem exists where in the pump performance decreases as the viscosity of pumped liquid becomes higher. The cause of this, i.e., the change of influence on the efHciency of various losses (for example, disc friction loss, the loss owing to the channel from inside impellers, leak loss and collision loss), accompanying the change of flow within the pumps, will be considered. In this study, taking notice of the loss of flow owing to the channel from inside impellers, the effect of impeller outlet angle and number of blades on the pump performance when high viscosity liquid is pumped up is investigated. It is clarified that the pumping performance was affected by the number of blades and the analysis of shaft power (disc friction power, water power and others) for the Reynolds number.
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Ohta et al. (1990) studied this question.