Exhaust gases from a wire processing oven are dis-charged

Chapter 8, Problem 8.59

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Exhaust gases from a wire processing oven are dis-charged into a tall stack, and the gas and stack surfacetemperatures at the outlet of the stack must be estimated.Knowledge of the outlet gas temperature Tm,ois useful for predicting the dispersion of effluents in the thermalplume, while knowledge of the outlet stack surface tem-perature Ts,oindicates whether condensation of the gasproducts will occur. The thin-walled, cylindrical stack is0.5 m in diameter and 6.0 m high. The exhaust gas flowrate is 0.5 kg/s, and the inlet temperature is 600C.(a) Consider conditions for which the ambient air tem-perature and wind velocity are 4C and 5 m/s,respectively. Approximating the thermophysicalproperties of the gas as those of atmospheric air,estimate the outlet gas and stack surface tempera-tures for the given conditions.(b) The gas outlet temperature is sensitive to variationsin the ambient air temperature and wind velocity.For T???25C, 5C, and 35C, compute and plotthe gas outlet temperature as a function of windvelocity for 2?V?10 m/s.