GATE ME 2019 Set 2 — Question 20
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Heat Transfer → Radiation → View Factors
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Question
Sphere 1 with a diameter of is completely enclosed by another sphere 2 of diameter . The view factor is
Correct answer
(D) 1.0
Solution
For a surface 1 completely enclosed by surface 2, all radiation leaving surface 1 must strike surface 2. By the definition of view factor, is the fraction of radiation leaving surface 1 that is intercepted by surface 2. Since surface 1 is completely enclosed, .
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