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2. Mechanical Engineering
3. air at 10deg c enters a 4mlong smooth rectangular duct...

# Question: air at 10deg c enters a 4mlong smooth rectangular duct...

###### Question details

Air at 10deg C enters a 4-m-long smooth, rectangular duct with a 7.5 cm X 15 cm cross section. The mass flow rate of air is 0.1 kg/s. If the sides of the duct are maintained at 150 degC, estimate: (a) the heat transfer coefficient, (b) air outlet temperature, (c) the rate of heat transfer, and (d) the pressure drop.