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9-48 Flue gases from an incinerator are released to atmosphere using a stack that is o.6 min diameter and 10.0 m high. The outer surface of the stack is at

40°C and the surrounding air is at10°C. Determine the rate of heat transfer from the stack, assuming (a) there is no wind and (b) the stack is exposed to 20 km/h winds.Scanned with CamScanner

Fig: 1