class 33 - Click to edit Master subtitle style 8/13/11 Real...

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Unformatted text preview: Click to edit Master subtitle style 8/13/11 Real Surfaces Chapter 12 Sections 12.4,5 8/13/11 Intensity – rate at which em ission from dA1 passes through dAn. The area of intensity com ponent of dA1 perpendicular to direction of radiation is dA1cos . θ λ ϖ θ θ λ λ d d dA dq I e cos ) , , ( 1 , ≡ Φ 8/13/11 ∫ ∫ ∫ ∞ = = 2 2 / , ) ( sin cos ) , , ( ) ( λ λ φ θ θ θ φ θ λ λ λ ππ λ λ d G G d d I G i ∫ ∫ ∫ ∞ = = 2 2 / , ) ( sin cos ) , , ( ) ( λ λ φ θ θ θ φ θ λ λ λ π π λ λ d E E d d I E e ∫ ∫ ∫ ∞ + = = 2 2 / , ) ( sin cos ) , , ( ) ( λ λ φ θ θ θ φ θ λ λ λ ππ λ λ d J J d d I J r e 8/13/11 Irradiation – radiation incident from all areas for intercepting surface ∫ ∫ ∫ ∞ = = 2 2 / , ) ( sin cos ) , , ( ) ( λ λ φ θ θ θ φ θ λ λ λ π π λ λ d G G d d I G i 8/13/11 Radiosity– all the radiant energy leaving a surface (including reflection) ∫ ∫ ∫ ∞ + = = 2 2 / , ) ( sin cos ) , , ( ) ( λ λ φ θ θ θ φ θ λ λ λ π π λ λ d J J d d I J r e 8/13/11 8/13/11 Absorptivity • The spectral, directional absorptivity : • The spectral, hemispherical absorptivity : • The total, hemispherical absorptivity : Assuming negligible temperature dependence, α ) , , ( ) , , ( , . , , φ θ λ φ θ λ α λ λ θ λ i abs i I I ≡ ) ( ) ( , λ λ α λ λ λ G G abs ≡ G G abs ≡ α 8/13/11 Reflectivity Reflectivity of an Opaque Material • The spectral, directional reflectivity : Assuming negligible temperature dependence: • The spectral, hemispherical reflectivity : • The total, hemispherical reflectivity : ) , , ( ) , , ( , . , , φ θ λ φ θ λ ρ λ λ θ λ i ref i I I ≡ ) ( ) ( , λ λ ρ λ λ λ G G ref ≡ G G ref ≡ ρ 8/13/11 Transmissivity Transmissivit y • The spectral, hemispherical transmissivity:...
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This note was uploaded on 08/13/2011 for the course CHEM 3210 taught by Professor Degrazia during the Fall '10 term at Colorado.

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class 33 - Click to edit Master subtitle style 8/13/11 Real...

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