Returning to the conditions of Problem 5.34, where the boundary layer was assumed to be fully turbulent, let us now consider the real situation where the boundary layer starts out as laminar, and then makes a transition to turbulent somewhere downstream of the leading edge. Assume a transition Reynolds number of 500,000 . For this case, calculate the percentage of drag that is due to flow separation (form drag). | Numerade

11.5: A Day in the Life of the Boundary Layer

13. A vertical plate is maintained at 40°C in 20°C still air. a) Determine the height at which the boundary layer will turn turbulent if turbulence sets in at Gr · Pr = 10^9. (2 Marks) b) With the help of neat sketch, show the development of boundary layer on the vertical plate for the case mention above. Also draw a similar sketch for another case, where the plate is maintained at 10°C in 30°C still air (2 Marks)