Question

The flow in volute casing outside the rotating impeller of a centrifugal pump is:

• A. axial flow
• B. free vortex flow
• C. forced vortex flow
• D. radial flow

Answer 1

Answer:

B. free vortex flow

The flow in the volute casing outside the rotating impeller of a centrifugal pump is a free vortex flow. This is because the external torque is absent outside the casing, causing the fluid to have a vortex motion due to the inertia of the fluid.