A long aluminum wire of diameter 3 mm is extruded at a temperature of 280°C. The wire is subjected to cross air flow at

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A long aluminum wire of diameter 3 mm is extruded at atemperature of 280°C. The wire is subjected to cross air flow at20°C at a velocity of 6.00 m/s. Determine the rate of heat transferfrom the wire to the air per meter length when it is first exposedto the air. The properties of air at 1 atm and the film temperatureof (Ts + T∞)/2 = (280 + 20)/2 = 150°C are k = 0.03443 W/m·°C, ν =2.860 × 10−5 m2/s, and Pr = 0.70275.
The rate of heat transfer from the wire to the air per meterlength when it is first exposed to the air is