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What is the value of the shape factor for two infinite parallel surface separated by a distance d?

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BPSC AE Paper 5 (Mechanical) 2019 Official Paper
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  1. 0
  2. ∞
  3. 1
  4. d

Answer (Detailed Solution Below)

Option 3 : 1
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Detailed Solution

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Concept:

Shape Factor is defined as the fraction of radiation energy leaving a surface that reaches another surface, for example, F12 means the fraction of energy leaving the surface 1 reaches surface 2.

Summation Rule: F11 + F12 = 1

Reciprocity theorem: A1 F12 = A2 F21 (A is the surface area)

Calculation:

Given:

For the infinite parallel surface, F11 = 0

∴ F12 = 1

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