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For a Reynolds number Rec=9×10^4 and chord length 1m, what is the laminar boundary layer thickness at the trailing edge (in cm)?(a) 2.34(b) 3(c) 1.5(d) 1.67This question was posed to me during an interview.The origin of the question is Laminar Flow topic in section Incompressible Flow over Airfoils of Aerodynamics

Answer» CORRECT answer is (d) 1.67

To elaborate: The laminar boundary layer thickness is given by δ=\(\frac {5X}{\SQRT{Re_x}}\), where in our QUESTION x is the chord length. Solving this we GET the thickness to be 5/3 cm (1.67 cm).


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