Boundary layer thickness

BOUNDARY LAYER THICKNESS:
Boundary layer thickness at distence x from leading edge is
S = (4.64×x/Rex^(1/2))
Here Rex is Reynolds number at distence x from leading edge.
Rex=PLxV/u
Where P=density of the fluid
           Lx=distence from leading edge
            V=velocity of fluid
            u=Dynamic viscosity of the fluid

If all variables are kept unchanged then
*Boundary layer thickness (s) is directly proportional to root of Lx(distence from leading edge)

 Example question:
Q1)

Solution
Since, boundary layer thickness is directly proportional to square root of distence from leading edge.
Where
S1(2mm) is boundary layer thickness at distence Lx1(2m) from leading edge
S2(? ) Boundary layer thickness at Lx2(4m)
So
(S1/S2)=(Lx1/Lx2)^(1/2)
(2/S2)=(2/4)^(1/2)
S2=2×2^(1/2)
S2=2×1.414
S2=2.828mm.(answer)
So option (B) is right answer.

Boundary layer thickness is over but, relation between Hydrodynamic boundary layer thickness and thermal boundary layer thickness will be updated very soon.

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By RAJKUMAR CLASSES