The atmospheric air at 30°C flows past a flat plate with a sharp leading edge. The velocity of the air is 4 m/s. The plate is heated uniformly throughout its entire length and is maintained at a...

The atmospheric air at 30°C flows past a flat plate with a sharp leading edge. The velocity of the air is 4 m/s. The plate is heated uniformly throughout its entire length and is maintained at a surface temperature of 50°C. Assuming that the transition occurs at a critical Reynolds number of 5 × 10⁵, find the distance from the leading edge at which the flow is in the boundary layer changes from laminar to turbulent. At this location, calculate (a) thickness of hydrodynamic and thermal boundary layers ; (b) total drag force per unit width of the plate; (c) heat transfer rate ; (d) mass enters the layer.