• # question_answer The thickness of laminar boundary layer at a distance 'X' from the leading edge over a flat plate varies as: A) $X$                             B) ${{X}^{1/2}}$C) ${{X}^{1/5}}$                                   D) ${{X}^{4/5}}$

Correct Answer: B

Solution :

Thickness of laminar boundary layer over a flat plate, $\delta =\frac{5x}{\sqrt{{{\operatorname{Re}}_{x}}}}=\frac{5x}{\sqrt{\frac{vx}{v}}}\propto {{x}^{1/2}}$

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