Absorption and emission characteristics of diffuse spherical enclosures: E.M. Sparrow and V.K. Jonsson
Ephraim M. Sparrow, Valdimir K. Jonsson, United States. National Aeronautics and Space Administration
National Aeronautics and Space Administration, 1962 - Science - 19 pages
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absorbed energy absorbed per unit absorption and emission absorption Q angle factor angle of cavity apparent absorptivity area is denoted black-body radiation boundary curve cavity interior cavity opening characteristics of spherical closed-form algebraic equation cp*cos cp*sin diffuse stream directional distribution distribution function distribution of absorbed emission characteristics emitters energy absorption energy carried energy locally absorbed entering the cavity external radiation fraction given by equation heat loss incident inclination angle incoming energy incoming radiation incoming rays integral equation isothermal spherical cavities jt(R sin cp*)2 multiplying equation 26 no-shadow regions opening angle cp overall rate parallel ray bundle particular thermal boundary R2sin2cp radiant energy leaving radiant energy streaming radiant flux leaving radiosity rate of energy rate of incoming rays that graze reemission reflected s(cp shadow and no-shadow shadow region sin2cp spatial and directional spherical cap spherical shell streaming from cavity surface absorptivity surface element surface normal tion uniformly distributed unit surface area wavelengths