Question #207487

Air is heated in a 4cmu 4cm square duct at uniform surface flux of 590 The mean air velocity is 0.32 m/s. At a section far away from the inlet the mean temperature is 40 . The mean outlet temperature is 120 . Determine the required length and maximum surface temperature.

Expert's answer

Mean temperature

Reynold's number,

The flow is laminar, hence the Nusslet number ,

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