Boundary layer separation is caused by the ____________________?
Correct answer: C. Adverse pressure gradient
- A. Reduction of pressure below vapour pressure
- B. Reduction of pressure gradient to zero
- C. Adverse pressure gradient
- D. Reduction of boundary layer thickness to zero
Explanation
An adverse pressure gradient means pressure increases in the direction of flow, slowing the boundary-layer fluid until it can reverse near the wall and separate. A zero or favourable pressure gradient does not by itself cause separation.
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