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An object of irregular shape has a characteristic length of L=1 m and is maintained at a uniform surface temperature of Ts = 400 K. When placed in atmospheric air at a temperature of T∞ = 300 K and moving with a velocity of u∞ = 100 m/s, the average heat flux from the surface to the air is 20,000 W/m2. If a second object of the same shape but with a characteristic length of L=5 m, is maintained at a surface temperature of T₂ = 400 K and is placed in atmospheric air at Too 300 K, what will the value of the average convection coefficient be if the air velocity is U = 20 m/s? (Use the average temperature of Ts and T∞ to find air properties if necessary)

An object of irregular shape has a characteristic length of L=1 m and is maintained at a uniform surface temperature of Ts = 400 K. When placed in atmospheric air at a temperature of T∞ = 300 K and moving with a velocity of u∞ = 100 m/s, the average heat flux from the surface to the air is 20,000 W/m2. If a second object of the same shape but with a characteristic length of L=5 m, is maintained at a surface temperature of T₂ = 400 K and is placed in atmospheric air at Too 300 K, what will the value of the average convection coefficient be if the air velocity is U = 20 m/s? (Use the average temperature of Ts and T∞ to find air properties if necessary)

Elements Of Electromagnetics
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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An object of irregular shape has a characteristic length of L=1 m and is maintained at a uniform surface temperature of Ts = 400 K. When placed in atmospheric air at a temperature of T∞ = 300 K and moving with a velocity of u∞ = 100 m/s, the average heat flux from the surface to the air is 20,000 W/m2. If a second object of the same shape but with a characteristic length of L=5 m, is maintained at a surface temperature of T₂ = 400 K and is placed in atmospheric air at Too 300 K, what will the value of the average convection coefficient be if the air velocity is U = 20 m/s? (Use the average temperature of Ts and T∞ to find air properties if necessary)
Transcribed Image Text:An object of irregular shape has a characteristic length of L=1 m and is maintained at a uniform surface temperature of Ts = 400 K. When placed in atmospheric air at a temperature of T∞ = 300 K and moving with a velocity of u∞ = 100 m/s, the average heat flux from the surface to the air is 20,000 W/m2. If a second object of the same shape but with a characteristic length of L=5 m, is maintained at a surface temperature of T₂ = 400 K and is placed in atmospheric air at Too 300 K, what will the value of the average convection coefficient be if the air velocity is U = 20 m/s? (Use the average temperature of Ts and T∞ to find air properties if necessary)
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