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The constant which is present while establishing a relationship for Cf and Rec for a laminar flow is_____(a) 2.65(b) 0.664(c) π(d) 1.33I have been asked this question in quiz.My enquiry is from Laminar Flow topic in section Incompressible Flow over Airfoils of Aerodynamics

Answer»

The correct option is (d) 1.33

Explanation: The COEFFICIENT of skin-friction DRAG is related to Reynolds NUMBER as Cf=\(\frac {1.328}{\sqrt{Re_c}}\) where REC is the Reynolds number at the trailing EDGE and the coefficient gives half the total skin-friction drag. The required constant is 1.328 for the case of a laminar flow.



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