Question

A fluid with kinematic viscosity $\nu$ flows in laminar stage along a flat plate with free-stream velocity V. at a distance x from the leading edge, the Reynolds number of the flow is given by $R=\frac{Vx}{\nu }$. The thickness of the boundary layer at x will be proportional to

• A. $x{R}^{1/2}$
• B. $x{R}^{-1/2}$
• C. $R^{1/2}$
• D. $R^{-1/2}$

Answer 1

The correct option is B $x{R}^{-1/2}$

$\delta =\frac{5x}{\sqrt{Re}}\left(Blasiussolution\right)$