Exhaust gases having properties similar to dry air enter a thin-walled cylindrical exhaust stack at 800 K. The stack is made of steel and is 8 m tall and 0.5 m inside diameter. If the gas flow rate is 0.5 kg/s and the heat transfer coefficient at the outer surface is 16 W/(m2 K), estimate the outlet temperature of the exhaust gas if the ambient temperature is 280 K.GIVENGas flow through a vertical cylindrical thin-walled steel exhaust stackGas properties are similar to dry airGas entrance temperature (Tb,in) = 800 KLength of stack (L) = 8 mDiameter of stack (D) = 0.5 mMass flow rate (m) = 0.5 kg/sHeat transfer coefficient on the outer surface (hc,o) = 16 W/(m2 K)Ambient temperature (T??) 280 KASSUMPTIONSRadiation heat transfer is negligibleNatural convection can be neglectedThe inlet to the stack is sharp-edgedThermal resistance of the stack wall isnegligible

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Taout-? Tạo D= 0.5 m L-8 m Ts,i m- 0.5 kg/s Ton-800 K