A square duct having D=23-cm and surface temperature T=70°C is located horizontally in an attic space with ambient temperature T-11°C. If the duct is subjected to ait flow of U=1.4-m/s, find the Nusselt number for the external flow over the duct as shown in the figure below.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A square duct having D=23-cm and surface temperature T=70°C is
located horizontally in an attic space with ambient temperature T=11°C.
If the duct is subjected to ait flow of U=1.4-m/s, find the Nusselt number for
the external flow over the duct as shown in the figure below.
U
air
T
Transcribed Image Text:A square duct having D=23-cm and surface temperature T=70°C is located horizontally in an attic space with ambient temperature T=11°C. If the duct is subjected to ait flow of U=1.4-m/s, find the Nusselt number for the external flow over the duct as shown in the figure below. U air T
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