A diffuse, opaque surface at 700 K has spectral emissivities of = 0 for 0

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A diffuse, opaque surface at 700 K has spectral emissivities of ɛλ = 0 for 0 < λ <  3 λm,  ɛλ = 0.5 for 3 μm < λ < 10 μm, and  ɛλ = 0.9 for 10 μm < λ < ∞. A radiant flux of 1000 W/m2, which is uniformly distributed between 1 and 6 μm, is incident on the surface at an angle of 30° relative to the surface normal.

Calculate the total radiant power from a 10-4 m2 area of the surface that reaches a radiation detector positioned along the normal to the area. The aperture of the detector is 10-5 m2, and its distance from the surface is 1 m.  

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Fundamentals of Heat and Mass Transfer

ISBN: 978-0471457282

6th Edition

Authors: Incropera, Dewitt, Bergman, Lavine

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