In ____________flow the fluid being thrown outward by the centrifugal force is again thrown forward by the torus shape of the rear half of the shell.

• A. Rotary
• B. Converter fluid
• C. Vortex
• D. Semicircular

Answer: (C)

In centrifugal flow, the outward fling of the fluid is redirected by the torus-shaped rear shell to throw the flow forward, creating a continuous swirling path. This tight, donut-shaped loop around the impeller is what we call a vortex flow—the fluid moves in a three-dimensional swirl rather than along a simple arc. The torus-shaped housing is key because it turns the outward momentum into forward momentum, sustaining the swirling motion as it exits toward the discharge. The idea of rotor-like rotation around the axis doesn’t capture the toroidal looping, and a semicircular description only hints at curvature without the full three-dimensional swirl. “Converter fluid” isn’t a standard way to describe this flow pattern.