Repeat Prob. 4–140 for a copper wire Prob Long aluminum wires of diameter 3 mm (r = are extruded… 1 answer below »

Repeat Prob. 4–140 for a copper wire  

Prob

Long aluminum wires of diameter 3 mm (r =   are extruded at a temperature of 350°C and exposed to atmospheric air at 30°C with a heat transfer coefficient of 35 W/m2 ·K. (a) Determine how long it will take for the wire temperature to drop to 50°C. (b) If the wire is extruded at a velocity of 10 m/min, determine how far the wire travels after extrusion by the time its temperature drops to 50°C. What change in the cooling process would you propose to shorten this distance? (c) Assuming the aluminum wire leaves the extrusion room at 50°C, determine the rate of heat transfer from the wire to the extrusion room

 

 

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