In a manufacturing process, long rods of different diameters are at a uniform temperature of 400°C in a curing oven, from which they are removed and cooled by forced convection in air at 25°C. One of the line operators has observed that it takes 280 s for a 40-mmdiameter rod to cool to a safe-to-handle temperature of 60°C. For an equivalent convection coefficient, how long will it take for an 80-mm-diameter rod to cool to the same temperature? The thermophysical properties of the rod are 2500 kg/m3, c = 900 J/kg ∙ K, and k = 15 W/m ∙ K. Comment on your result. Did you anticipate this outcome?
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