Question: 2 . ( 1 5 ) Cold air at 5 C enters an uninsulated air conditioning duct with a 5 by 1 0

2.(15) Cold air at 5 C enters an uninsulated air conditioning duct with a 5" by 10" cross section. It crosses a roof where the ambient air keeps the duct wall at 20 C .
a) What is the maximum air volumetric flow rate to keep the flow laminar in the duct?
b) At that flow rate, how long before the flow becomes fully developed in the duct?
c) If the duct is 20 m long, what is the mean outlet temperature?
2 . ( 1 5 ) Cold air at 5 C enters an uninsulated

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