Question: 3 . 2 . Air at 1 . 5 atm and 4 0 C flows through a 1 0 m rectangular duct of 4 0

3.2. Air at 1.5 atm and 40C flows through a 10 m rectangular duct of 40 cm by 25 cm
with a velocity of 5ms. The surface temperature of the duct is maintained at
120C, and the average air temperature at exit is 80C. Calculate the total heat
transfer using Gnielinski's correlation and check your result by energy balance.
3 . 2 . Air at 1 . 5 atm and 4 0 C flows through

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