1. Atmospheric air at 20°C flows with a freestream velocity of 5 m/s over a 2 m diameter spherical tank which is maintained at 80°C. Compute the average heat transfer coefficient and the heat transfer...

1. Atmospheric air at 20°C flows with a freestream velocity of 5 m/s over a 2 m diameter spherical tank which is maintained at 80°C. Compute the average heat transfer coefficient and the heat transfer rate from the sphere to the air.

2. Air at 27°C flows with a free-stream velocity of 40 m/s along a flat plate 2 m long. Calculate the boundary layer thick ness at the end of the plate for air at (a) 1/2 atm, (b) 1 atm and (c) 2 atm.