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In a manufacturing process, long aluminum rods of square cross section with d 25 mm are cooled from an initial temperature of T; = 400°C. Which configuration in the sketch

should be used to minimize the time needed for the rods to reach a safe-to-handle temperature of 60°C when exposed to air in cross flow at V =8 m/s, T = 30°C? What is the required cooling time for the preferred configuration? The emissivity of the rods is e = 0.10 and the surroundings temperature is Tur = 20°C.

Fig: 1

Fig: 2