The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to
A
$$ - \frac{1}{3}$$
B
$$ - \frac{2}{3}$$
C
1
D
$$-1$$
Correct Answer: $$ - \frac{1}{3}$$
The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to $$ - \frac{1}{3}.$$