Modeling > Modeling Radiation > Modeling Surface-to-Surface Radiation > Formulation > Nomenclature

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Nomenclature

In the equations given above, the following nomenclature applies:

absorptivity

angle between the surface normal and a line joining two surfaces [rad]

T

emitted energy [J]

emissivity

k th constituent boundary cell face of patch i

view or configuration factor for surface pair

total intensity leaving surface k, where intensity is defined as the "radiative energy passing through an area per unit solid angle, per unit of the area projected normal to the direction of passage, and per unit time" [1]. []

incident radiant flux []

total emitted radiant flux or radiosity []

L

distance [m]

n

normal vector

total number of patches

total power leaving surface 1 and incident on surface 2 [W]

heat flux through boundary cell face f []

reflectivity

Stefan-Boltzmann constant []

S

surface area [m2]

T

temperature [K]

transmissivity

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