Explain why positive displacement pumps are generally preferred over centrifugal pumps for high-viscosity fluid applications.

Positive displacement pumps are generally preferred over centrifugal pumps for high-viscosity fluid applications because their flow rate is less affected by changes in fluid viscosity. Viscosity is a fluid's resistance to flow. Centrifugal pumps operate by imparting kinetic energy to the fluid, which is then converted to pressure. As viscosity increases, the internal friction within the pump also increases, reducing the pump's efficiency and its ability to gene....