How does increasing the fluid temperature of irrigation water impact the performance curve of a centrifugal pump, assuming all other variables remain constant?

Increasing the fluid temperature of irrigation water generally has a minor, though not usually negligible, impact on the performance curve of a centrifugal pump. The primary reason is that water's viscosity and density change with temperature. As the water temperature increases, its viscosity decreases. Viscosity is the measure of a fluid's resistance to flow; lower viscosity means the fluid flows more easily. This reduction in viscosity results in slightly reduced frictional losses within the pump itself. This means that, for the same impeller speed, the pump can deliver a slightly higher flow rate and may achieve a slight....