Question: 5 A . 2 ) 0 . 1 k g s of air flows through a 2 0 cm duct with uniform wall temperature of

5A.2)0.1kgs of air flows through a 20 cm duct with uniform wall temperature of 100C. Air enters the duct at 20C and exits at 70C. The internal convective coefficient, h=100Wm2K.
a) What is the duct length?
b) How long does the duct have to be to increase the exit temperature to 85C?
5 A . 2 ) 0 . 1 k g s of air flows through a 2 0

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