Question: Air at an average temperature of 150?C flows through a short square duct 10 x 10 x 2.25 cm at a rate of 15 kg/h.

Air at an average temperature of 150?C flows through a short square duct 10 x 10 x 2.25 cm at a rate of 15 kg/h. The duct wall temperature is 430?C. Determine the average heat transfer coefficient, using the duct equation with appropriate L/D correction. Compare your results with flow-over-flat-plate relations.GIVENAir flowing through a short square ductAverage air temperature (Ta) = 150?CDuct dimensions = 10 x 10 x 2.25 cm = 0.1 x 0.1x 0.0225 mDuct wall surface temperature (Ts) = 430?CMass flow rate (m) = 15 kg/hASSUMPTIONSConstant and uniform duct walltemperature

T,=430C 10 cm Alr T-150C 10 cm 2.25 cm

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