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Centrifugal pump casing and pressure recovery: Does the casing convert kinetic energy into pressure energy before discharge? Assume a standard volute or diffuser-type casing and steady incompressible flow. Choose the correct option (true/false with reasoning).

Difficulty: Easy

Correct Answer: Yes — the volute/diffuser casing recovers velocity head into static pressure before the water leaves the casing.

Explanation:

Concept

  • The volute/diffuser increases flow area, reducing velocity and converting kinetic energy to static pressure (diffusion effect).

Why this is trueBy Bernoulli's principle and diffuser action, a gradual area increase lowers V and raises p, improving static head before discharge.

Common pitfallsConfusing impeller (adds energy mainly as velocity) with casing (recovers part of that velocity as pressure).

Final AnswerTrue — the casing converts kinetic energy to pressure energy before the water exits.

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