Discussion
For a laminar layer, the ratio of displacement thickness to boundary layer thickness is nearest to
Answer: D
With \( \delta^* = 1.721x/\sqrt{Re_x} \) and \( \delta = 5x/\sqrt{Re_x} \), the ratio is \( 1.721/5 = 0.344 \). Roughly a third, in other words: the outer streamlines are pushed out by about a third of the layer's own thickness.
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