In the effort to increase the removal of heat from a hot surface at 120°C, a cylindrical p...

In the effort to increase the removal of heat from a hot surface at 120°C, a cylindrical pin fin (kf =237 W/m · K) with diameter of 5 mm is attached to the hot surface. Air at 20°C (1 atm) is flowing across the pin fin with a velocity of 10 m/s. Determine the maximum possible rate of heat transfer from the pin fin. Evaluate the air properties at 70°C.