A small disk 5 mm in diameter is positioned at the center
Chapter 12, Problem 12.55(choose chapter or problem)
A small disk 5 mm in diameter is positioned at the center of an isothermal, hemispherical enclosure. The disk is diffuse and gray with an emissivity of 0.7and is maintained at 900 K. The hemispherical enclo-sure, maintained at 300 K, has a radius of 100 mm andan emissivity of 0.85.Calculate the radiant power leaving an aperture ofdiameter 2 mm located on the enclosure as shown.
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