Air at I atm and 285 K enters a 2-m-long rectangular duct with cross section 75 mm by 150 mm. The...

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Air at I atm and 285 K enters a 2-m-long rectangular duct with cross section 75 mm by 150 mm. The duct is maintained at a constant surface temperature of 400 K and the air mass flow rate is 0.10 kg/s. Determine the heat transfer rate from the duct to the air and the air outlet temperature.

Robert · Accepted Answer

Air at I atm and 285 K enters a 2-m-long rectangular duct with cross section 75 mm by 
150 mm. The duct is maintained at a constant surface temperature of 400 K and the air 
mass flow rate is 0.10 kg/s. Determine the heat transfer rate from the duct to the air 
and the air outlet temperature. 
 
Givn : 
 
P = 1 atm 
Ti = 285 K 
Tw = 400 K 
Te = ?? 
 
First, we evaluate the Reynolds number at the inlet bulk temperature to determine the 
flow regime.The properties of air at P=1 atm and T = 285 K are 
 
Thermal Conductivity k = 2.5064E-05 kW/mK 
Density, ? = 1.224282 kg/m3 
Specific heat , cp1.006474 kJ/kg-K 
Kinematic viscosity , ?  14.5618E-06 m2/s 
Dynamic Viscosity ,? = 17.82776E-06 Pa-s 
Prandtl number, Pr =  0.

Air at I atm and 285 K enters a 2-m-long rectangular duct with cross section 75 mm by 150 mm. The duct is maintained at a constant surface temperature of 400 K and the air mass flow rate is 0.10 kg/s....

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