The boundary layer thickness for an incompressible, laminar flow at a distance x with Reynolds number Rex is δ. Which is____(a) Directly proportional to √x(b) Inversely proportional to x(c) Directly proportional to Rex(d) Inversely proportional to Rex^2The question was asked in an online quiz.My enquiry is from Laminar Flow topic in section Incompressible Flow over Airfoils of Aerodynamics

The boundary layer thickness for an incompressible, laminar flow at a

1.	The boundary layer thickness for an incompressible, laminar flow at a distance x with Reynolds number Rex is δ. Which is____(a) Directly proportional to √x(b) Inversely proportional to x(c) Directly proportional to Rex(d) Inversely proportional to Rex^2The question was asked in an online quiz.My enquiry is from Laminar Flow topic in section Incompressible Flow over Airfoils of Aerodynamics
Answer» Right option is (a) Directly PROPORTIONAL to √x Explanation: The boundary layer thickness for an incompressible, laminar flow over a flat plate at ZERO angle of attack, at a DISTANCE x where Reynolds number is Rex is given by δ=\(\frac {5x}{\sqrt{Re_x}}\). Here Reynolds number is Rex=\(\frac {xVd}{U}\). THUS, the thickness is directly proportional to √x.

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