Question

Air at 4  104 kg/s and 27°C enters a triangular duct that is 20 mm on a side and 2 m
long. The duct surface is maintained at 100°C. Assuming fully developed flow
throughout the duct, determine the air outlet temperature.
PROPERTIES: Table A-4, Air (assume Tm = 325K, 1 atm): cp = 1008 J/kg K, μ = 196.4
10-7 Ns/m2

, k = 0.0282 W/m K, Pr = 0.707.

Answer 1

Answer:

Air at 4  104 kg/s and 27°C enters a triangular duct that is 20 mm on a side and 2 m

long. The duct surface is maintained at 100°C. Assuming fully developed flow

throughout the duct, determine the air outlet temperature.

PROPERTIES: Table A-4, Air (assume Tm = 325K, 1 atm): cp = 1008 J/kg K, μ = 196.4

10-7 Ns/m2

, k = 0.0282 W/m K, Pr = 0.707.

Explanation:

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