Which component's movement accelerates the liquid to generate pressure in a centrifugal pump?

Which component's movement accelerates the liquid to generate pressure in a centrifugal pump?

• A. Diffuser
• B. Casing
• C. Volute
• D. Impeller

Answer: (D)

In a centrifugal pump, the energy that starts the pressure rise comes from the rotating impeller. As the impeller spins, its vanes fling the liquid outward, accelerating it and increasing its velocity. That push creates kinetic energy in the fluid. The surrounding stationary parts—the diffuser, volute, and casing—then slow the fluid down and convert that extra velocity intoStatic pressure, raising the discharge pressure. The casing mainly encloses and directs flow; it doesn’t actively accelerate the liquid. So the component whose movement directly accelerates the liquid to begin generating pressure is the impeller.

In a centrifugal pump, the energy that starts the pressure rise comes from the rotating impeller. As the impeller spins, its vanes fling the liquid outward, accelerating it and increasing its velocity. That push creates kinetic energy in the fluid. The surrounding stationary parts—the diffuser, volute, and casing—then slow the fluid down and convert that extra velocity intoStatic pressure, raising the discharge pressure. The casing mainly encloses and directs flow; it doesn’t actively accelerate the liquid. So the component whose movement directly accelerates the liquid to begin generating pressure is the impeller.