Cylindrical pillars similar to those of 4.22 are
Chapter , Problem 13.106(choose chapter or problem)
Cylindrical pillars similar to those of 4.22 are positioned between the glass sheets with a pillarto-pillar spacing of W. The inside surface of one glass sheet is treated with a low-emissivity coating characterized by 1 0.05. The second inner surface has an emissivity of 2 0.95. Determine the ratio of conduction to radiation heat transfer through a square unit area of dimension W W for W 10, 20, and 30 mm. The stainless steel pillar is located at the center of the unit area and has a length of L 0.4 mm and diameter of D 0.15 mm. The contact resistances and glass temperatures are the same as in 4.22. 13.
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