What is viscosity and why is it important?
Viscosity is defined as the property of resistance to flow in a fluid. Viscosity of a fluid governs its flow. Changing the diameter of a pump impeller affects the flow, head and input brake horsepower of the pump in different proportions. Changing the impeller diameter affects the flow through the pump by a proportion equal to the increase or decrease in diameter. The pump head is changed by the square of the proportion of diameter change, while the brake horsepower is changed by the cube of the proportion of diameter change. The viscosity of a fluid will determine the type of pump and configuration required. Viscosity is sometimes influenced by temperature.
