Air at 20 kPa and 20 °C flows across a flat plate 60 cm long. The free stream velocity is 30 m/s, and the plate is heated over its total length to a temperature of 55 °C. The fluid velocity is measured 30 cm from the edge of the plate and found to be 22.5 m/s.
a. Calculate the Reynolds number.
b. Is the flow laminar or turbulent? Justify your answer.
c. Calculate the height of the boundary layer at the point where the flow velocity is 22.5 m/s.