Civil Engineering MCQAE Level Civil Engineering
In a boundary layer developing over a flat plate, the boundary layer thickness delta increases as:
Fluid MechanicsBoundary LayerMEDIUM
Choose the correct answer
A
x^(1/2) for laminar flow (Blasius)
B
x^(1) linearly
C
x^2
D
Constant
Correct Answer
A. x^(1/2) for laminar flow (Blasius)
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Blasius solution for laminar boundary layer on flat plate: delta/x = 5/sqrt(Re_x) = 5/sqrt(Vx/nu), so delta proportional to sqrt(x) = x^(1/2). For turbulent BL: delta proportional to x^(4/5).
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