Boundary layer exists in flow_________________?
Correct answer: A. Of real fluids
- A. Of real fluids
- B. Over flat surfaces only
- C. In pipes only
- D. Of ideal fluids only
Explanation
A boundary layer forms when viscosity causes the fluid velocity to change from zero at a solid wall to the external-flow value. Therefore it occurs in real-fluid flow, not only over flat surfaces or inside pipes.
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