Question #286085
Air is heated in a 4cm×4cm sheet metal duct with a uniform surface
heat flux of 590 W/m2. The mean velocity is 3.2 m/s. The sheet
metal has an average roughness 0.05 mm. If the air enters at 20 ºC
and leaves at a mean temperature of 120 ºC, determine the following
(ignore entrance effects):
[a] The required length of the duct.
[b] The maximum surface temperature.
Expert's answer
Answer with diagram and table is given below:
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