Question

Circulation is referred to as

• A. Flux of vorticity
• B. Velocity field
• C. Divergence of velocity
• D. Mass flux

Hint:

Vorticity is the curl of the velocity field; its surface integral gives circulation.

Answer 1

The Correct Option is A

Circulation in fluid dynamics: Circulation is defined as the line integral of velocity around a closed loop. It essentially measures the total "circulatory" effect or rotation of the fluid along a closed path.

Explanation: Within the context of fluid dynamics, circulation is best understood as the flux of vorticity. Vorticity, in turn, is a measure of local rotation within the fluid. Hence, the correct understanding connects circulation directly with the rotational aspects of the flow, thereby making it synonymous with the flux of vorticity through a given surface.

The options were:

1. Flux of vorticity
2. Velocity field
3. Divergence of velocity
4. Mass flux

Given this understanding, the correct answer is clearly Flux of vorticity.