Cooling analysis of aluminum extrusion (forced convection, transient conduction): determine the minimum time required for an aluminum extrusion to cool to a maximum internal temperature of 40 °c. the extrusion has a square cross section of 4 cm x 4 cm and exits the extruder at a uniform temperature of 150 °c. 20 °c air can be directed towards the extrusion at a velocity of 15 m/s.

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(b)

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