Thermodynamics HW Solutions 873

# Thermodynamics HW Solutions 873 - 11-28C Irradiation G is...

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Chapter 11 Fundamentals of Thermal Radiation Radiation Intensity 11-26C A solid angle represents an opening in space, whereas a plain angle represents an opening in a plane. For a sphere of unit radius, the solid angle about the origin subtended by a given surface on the sphere is equal to the area of the surface. For a cicle of unit radius, the plain angle about the origin subtended by a given arc is equal to the length of the arc. The value of a solid angle associated with a sphere is 4 π . 11-27C The intensity of emitted radiation I e ( θ , φ ) is defined as the rate at which radiation energy is emitted in the ( θ , φ ) direction per unit area normal to this direction and per unit solid angle about this direction. For a diffusely emitting surface, the emissive power is related to the intensity of emitted radiation by e Q d e I E π = (or e I E , λλ = for spectral quantities).
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Unformatted text preview: 11-28C Irradiation G is the radiation flux incident on a surface from all directions. For diffusely incident radiation, irradiation on a surface is related to the intensity of incident radiation by i I G = (or i I G , = for spectral quantities). 11-29C Radiosity J is the rate at which radiation energy leaves a unit area of a surface by emission and reflection in all directions. . For a diffusely emitting and reflecting surface, radiosity is related to the intensity of emitted and reflected radiation by r e I J + = (or r e I J + = , for spectral quantities). 11-30C When the variation of a spectral radiation quantity with wavelength is known, the correcponding total quantity is determined by integrating that quantity with respect to wavelength from λ = 0 to λ = ∞ . 11-11...
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## This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.

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