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 °C and leaves at a mean temperature of 120 °C, determine the following (ignore entrance effects): [a] The required length of the duct. [b] The maximum surface temperature.
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 °C and leaves at a mean temperature of 120 °C, determine the following (ignore entrance effects): [a] The required length of the duct. [b] The maximum surface temperature.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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![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 °C
and leaves at a mean temperature of 120 °C, determine the
following
(ignore entrance effects):
[a] The required length of the duct.
[b] The maximum surface temperature.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F37865804-b87a-4a45-bbf4-006b73fd4bfc%2Ffabc5f3a-f0d5-4945-8706-38ac734df9f6%2Fb1phpwp_processed.jpeg&w=3840&q=75)
Transcribed Image Text: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 °C
and leaves at a mean temperature of 120 °C, determine the
following
(ignore entrance effects):
[a] The required length of the duct.
[b] The maximum surface temperature.
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