# Air at 30?C enters a rectangular duct 1 m long and 4 mm by 16 mm in

## Question:

Air at 30?C enters a rectangular duct 1 m long and 4 mm by 16 mm in cross-section at a rate of 0.0004 kg/s. If a uniform heat flux of 500 W/m2 is imposed on both of the long sides of the duct, calculate(a) The air outlet temperature(b) The average duct surface temperature, and(c) The pressure drop.GIVENAir flowing through a rectangular ductInlet bulk air temperature (Tb,in) = 30?CDuct length (L) = 1 mDuct height (H) 4 mm = 0.004 mDuct width (w) = 16 mm = 0.016 mASSUMPTIONSThe short sides of the duct are insulatedEntrance effects arenegligible

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## Principles of heat transfer

**ISBN:** 978-0495667704

7th Edition

**Authors:** Frank Kreith, Raj M. Manglik, Mark S. Bohn