What device converts kinetic energy into pressure in the flow path of steam?

What device converts kinetic energy into pressure in the flow path of steam?

• A. Diffuser
• B. Nozzle
• C. Valve
• D. Impeller

Answer: (A)

The device is a diffuser. It slows the steam by expanding the flow area, which lowers velocity. As velocity drops, static pressure rises, so kinetic energy is converted back into pressure energy. This is the opposite of a nozzle, which speeds up flow by reducing area and converting pressure into kinetic energy. An impeller adds energy to the fluid, increasing both velocity and pressure, while a valve primarily throttles flow and alters pressure without intentionally converting kinetic energy to pressure in the same way a diffuser does.

The device is a diffuser. It slows the steam by expanding the flow area, which lowers velocity. As velocity drops, static pressure rises, so kinetic energy is converted back into pressure energy. This is the opposite of a nozzle, which speeds up flow by reducing area and converting pressure into kinetic energy. An impeller adds energy to the fluid, increasing both velocity and pressure, while a valve primarily throttles flow and alters pressure without intentionally converting kinetic energy to pressure in the same way a diffuser does.