Which term best describes water flow around a propeller's arc when it rotates?

Which term best describes water flow around a propeller's arc when it rotates?

• A. SWEPT
• B. CURRENT
• C. VORTEX
• D. SUCTION

Answer: (C)

When a propeller turns, it pushes and deflects water, creating a swirling, circular motion in the fluid around the blade arc. This rotating flow forms a vortex, with strong trailing vortices curling off the blade tips as the water leaves the blades. The best term to describe this water behavior is vortex because it captures the circular, swirling motion produced by the rotating blades. The other options don’t fit as well. Swept describes the path or area the blade covers, not the water’s swirling motion. Current is a general flow term and doesn’t specify the rotational pattern created by a rotating blade. Suction refers to the low-pressure region on the blade surface, not the overall swirling flow around the arc.

When a propeller turns, it pushes and deflects water, creating a swirling, circular motion in the fluid around the blade arc. This rotating flow forms a vortex, with strong trailing vortices curling off the blade tips as the water leaves the blades. The best term to describe this water behavior is vortex because it captures the circular, swirling motion produced by the rotating blades.

The other options don’t fit as well. Swept describes the path or area the blade covers, not the water’s swirling motion. Current is a general flow term and doesn’t specify the rotational pattern created by a rotating blade. Suction refers to the low-pressure region on the blade surface, not the overall swirling flow around the arc.