1 m long aluminum wire of diameter 3 mm (ρ= 2702 kg/ m3, C p = 0.896 kJ/kg⋅K, k = 236 W/m⋅K,) is extruded at a temperature of 350° C and exposed to atmospheric air at 30° C with a heat transfer coefficient of 35 W/ m 2 ⋅K. Determine how long it will take for the wire temperature to drop to 50° C.
ref. Yunus Cengel , Afshin Ghajar Heat And Mass Transfer  6th Edition, Problem 4.144, Chapter 4,