Air at 27°C and 1 atm pressure flows over a flat plate with a velocity of 2 m/s. Estimate (a) the boundary layer thickness at distances of 20 cm and 40 cm from the leading edge of the plate and (b)...

Air at 27°C and 1 atm pressure flows over a flat plate with a velocity of 2 m/s. Estimate (a) the boundary layer thickness at distances of 20 cm and 40 cm from the leading edge of the plate and (b) the mass flow that enters the boundary layer between x = 20 cm and x = 40 cm. Take m of air at 27°C as 1.85
 10^–5
kg/ms. Assume unit depth in z-directions. If the plate is heated over its entire length to a temperature of 60°C, calculate the heat transfer in (c) the first 20 cm of the plate and (d) the first 40 cm of the plate. (e) Compute the drag force exerted on the first 40 cm of the plate. Properties of air at 316.5 K are n = 17.36
 10^–6
m²/s, k = 0.02749 W/m K, Pr = 0.7 and c_p
= 1.006 kJ/kg K.