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Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ = 400 K and T₂ = 300 K.

Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ = 400 K and T₂ = 300 K.

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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Example 10 Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ = 400 K and T₂ = 300 K. 1. Draw the radiation network. 2. If the surfaces are black, what is the net rate of radiation exchange between the spheres? 3. What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with ₁ = 0.5 and ₂ = 0.05?
Transcribed Image Text:Example 10 Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ = 400 K and T₂ = 300 K. 1. Draw the radiation network. 2. If the surfaces are black, what is the net rate of radiation exchange between the spheres? 3. What is the net rate of radiation exchange between the surfaces if they are diffuse and gray with ₁ = 0.5 and ₂ = 0.05?
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