In a manufacturing process, long rods of
Chapter 5, Problem 5.68(choose chapter or problem)
In a manufacturing process, long rods of differentdiameters are at a uniform temperature of 400C in acuring oven, from which they are removed and cooledby forced convection in air at 25C. One of the lineoperators has observed that it takes 280 s for a 40-mm-diameter rod to cool to a safe-to- handletemperature of60C. For an equivalent convection coefficient, howlong will it take for an 80-mm- diameter rod to cool tothe same temperature? The thermophysicalpropertiesof the rod are ??2500 kg/m3, c?900 J/kg?K, andk?15 W/m?K. Comment on your result. Did youanticipate this outcome?
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