The phenomenon of generation of lift by rotating an object placed
| The phenomenon of generation of lift by rotating an object placed in a free stream is known as
A. Coanda effect
B. Magnus effect
C. Scale effect
D. Buoyancy effect
Please scroll down to see the correct answer and solution guide.
Right Answer is: B
SOLUTION
When the flow is into air, the atmospheric pressure is equal on all sides around the flow. But when we put something such as a surface on one side of the flow, we are blocking the atmosphere from interacting with the flow from that side, which results in a pressure imbalance between the side that is open to the atmosphere, called Coanda effect.
When a body is submerged (partially or fully) in fluid, it experiences a upward force called buoyancy forces and effect is called buoyancy effect.
If a cylinder is rotated in a uniform stream, there will be an automatic generation of lift force. This effect first observed by Magnus, so called Magnus effect.