What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate ?
Correct answer: A. 0.5
- A. 0.5
- B. 1
- C. 1.5
- D. 2
Explanation
For a linear profile, u/U = y/δ, so the displacement thickness is ∫₀δ(1 − u/U)dy = δ/2. Therefore, its ratio to the boundary-layer thickness is 0.5.
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