1. Explain why the bulk temperature defined by Eq. 7.7-3 is equal to T∞.
2. Air at atmospheric pressure and 90°F flows past a flat plate maintained at 600°F. The plate is 3 ft long and the air velocity is 105 ft/sec. Find the heat transferred from the plate, per foot of width.
3. Water at 100°F flows at a velocity of 14 ft/sec past a steam-heated tube 1 in. in diameter. If the outside surface of the tube is 187°F, find the heat transfer per unit length of tube.