How does a diffuser pump convert fluid velocity into pressure more efficiently?

In a diffuser pump, the conversion of fluid velocity into pressure is achieved by passing the fluid through a ring of fixed vanes after it leaves the impeller. These vanes act to diffuse the liquid, which provides a more controlled flow and allows for a more efficient conversion of velocity head into pressure head.1

This process is a practical application of the principles of fluid mechanics, where kinetic energy is converted into pressure energy as the fluid slows down. By using fixed vanes to guide the fluid, the pump minimizes energy losses that might otherwise occur in less controlled flow environments, ensuring that the transition from high velocity to high pressure is handled effectively.231