The boundary layer thickness at a given section along a flat plate _____________ with increasing Reynold's number?
Correct answer: D. Decreases
- A. Increases
- B. May increase or decrease
- C. Remain same
- D. Decreases
Explanation
For a flat plate, laminar boundary-layer thickness varies approximately as δ ∝ x/√Reₓ. Therefore, at a fixed section, increasing Reynolds number makes the boundary layer thinner.
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