Answer:
(a) when the distance x is 0.3 m, the boundary layer thickness is 0.0055 m = 5.5 mm.
(b) when the distance x is 3 m, the boundary layer thickness is 0.0174 m = 17.4 mm.
(c) when the distance x is 30 m, the boundary layer thickness is 0.055 m = 55 mm.
Explanation:
For a laminar flow:
[tex]d = C\sqrt{x}[/tex] ;
where;
d is the boundary layer thickness = 11 mm
x is the distance from the leading edge = 1.2 m
C is a constant =?
[tex]C = \frac{d}{\sqrt{x}} = \frac{11 X 10^{-3}}{\sqrt{1.2}} = 0.010042[/tex]
Part (a): when x = 0.3m
d = C√x
= 0.010042 × √0.3
= 0.0055 m = 5.5 mm
Part (b): when x = 3.0 m
d = C√x
= 0.010042 × √3.0
= 0.0174 m = 17.4 mm
Part (c): when x = 30 m
d = C√x
= 0.010042 × √30
= 0.055 m = 55 mm
