Boundary layer separation is characterised by one of the conditions given below, where 'Re' is the Reynolds number for the flow. Select the appropriate conditions ?
Correct answer: C. Re >>1, decelerating flow
- A. Re <> 1, accelerating flow
- B. Re << 1, decelerating flow
- C. Re >>1, decelerating flow
Explanation
Boundary-layer separation requires a sufficiently large Reynolds number and an adverse pressure gradient, represented here by decelerating flow. At low Reynolds number, viscous effects suppress the usual separation condition.
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