A smooth, flat, thin fin of copper extending out from a tube is 51 mm by 51 mm square. Its temperature is approximately uniform at 82.2° C. Cooling air at 15.6° C and 1 atm abs flows parallel to the...

Extracted text: A smooth, flat, thin fin of copper extending out from a tube is 51 mm by 51 mm square. Its temperature is approximately uniform at 82.2° C. Cooling air at 15.6° C and 1 atm abs flows parallel to the fin at a velocity of 12.2 m/s. 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 turbulent, calculate h. [77.2 W/m²] For air at 48.9° C: µ= 1.9× 10-5 Pa s, p= 1.097 kg/m³, k = 0.028 W/m K and Np. = 0.704