A low-speed wind tunnel is provided with air supply up to a speed of 50 m/s at 20 °C. One needs to study the behaviour of the boundary layer over a flat plate kept inside the wind tunnel up to a...

A low-speed wind tunnel is provided with air supply up to a speed of 50 m/s at 20 °C. One needs to study the behaviour of the boundary layer over a flat plate kept inside the wind tunnel up to a Reynolds number of Re_x
= 10⁸
. What is the minimum plate length that should be used? At what distance from the leading edge would the transition occur if the critical Reynolds number is Re_x, c = 3.5 × 10⁵
? At 25 °C, n of air is 15.7 × 10^–6
m²
/s.