Study on centrifugal pump for high viscosity liquids (Effect of impeller output angle on the pump performance)

When centrifugal pumps are used for pumping high viscosity liquid, it is a problem that pump efficiency decreases as the viscosity of pumped liquid is higher. As the cause, the change of influence on the efficiency 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 channel from inside impellers, the effects of impeller outlet angle and number of blades on the pump efficiency, when high viscosity liquid is pumped up, were investigated.