Cooling Air is flowing parallel with a velocity of 12.2 m/s at a pressure of 1 atm and a temperature of 15.6 to a smooth, flat, thin fin of copper extending out from a tube is 51 mm by 51 mm square. The temperature of the copper fin is approximately uniform at 82.2.

(a) For laminar flow, calculate the heat-transfer coefficient, h;

(b) If the leading edge of the fin is rough so that all of the boundary layer or film next to the fin is completely turbulence, calculate h.