Question

Which one of the following is an irrotational flow?

• A. Free vortex flow
• B. Forced vortex flow
• C. Coutte flow
• D. Wake flow

Answer 1

Answer:

A. Free vortex flow

Vortex flow is the motion of a fluid in a curved path. Forced vortex is rotational, while free vortex is irrotational. Irrotational flow is the one where no external torque is required to rotate the fluid mass. Couette flow is the laminar flow of a viscous fluid between two parallel plates, where the flow is driven by viscous drag force. The moment of momentum is constant in a free vortex, and it is applicable as