As part of a heat treatment process, cylindrical, 304 stainlesssteel rods of 100-mm diameter are cooled from an initialtemperature of 500ºC by suspending them in an oil bath at 25ºC. Ifa convection coefficient of 500 W/m2·K is maintained bycirculation of the oil, how long does it take for the centerline ofa rod to reach a temperature of 52ºC, at which point it iswithdrawn from the bath? If 9 rods of length 1 m are processed perhour, what is the nominal rate at which energy must be extractedfrom the bath (the cooling load)?
