Discussion
Assertion (A): A turbulent boundary layer resists separation better than a laminar one.
Reason (R): Turbulent mixing carries high-momentum fluid down towards the wall.
Select the correct answer from the options below.
Answer: B
Both are true and the second explains the first. The extra momentum near the surface lets the layer push further into a rising pressure before the wall shear vanishes. The same mechanism raises the velocity gradient at the wall and so costs more skin friction, which is the standing trade of the subject.
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