Let us know about how does viscosity of a liquid
affect the selection of centrifugal pump?
As we know that disk friction varies as the fifth
power of the diameter of the impeller but only as the speed cubed, it is
desirable to use the highest speed (and the resulting smaller impeller
diameter) consistent with design conditions.
Head loss due to viscosity increases as operating
conditions approach the best efficiency point of the pump because of increased
velocity through the impeller.
Therefore, there is an advantage in selecting a
relatively oversized pump for highly viscous liquid so as to place the
operating conditions well to the left of capacity at best efficiency on low
viscosity service.
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