Exhaust gases from a wire processing oven are discharged into a tall stack. The thin-walled cylindrical stack is 0.5 m in diameter and 6.0 m high. The exhaust gas flow mean velocity is 10 m/s and the inlet temperature is 800 K. The ambient air temperature is 300 K and wind velocity is 20 miles per hour, respectively. Approximate the exhaust gas properties as those of the atmospheric air at 700 K and assume the air properties outside the stack as those of the atmospheric air at 400K