Evaluation of effective emissivities of nonisothermal cavities.
Local effective spectral and total emissivities of nonisothermal cavities having diffuse surfaces are evaluated. The effective emissivity of the cavity wall around the half-depth of a cylinder is little affected by a linear decrease or increase of temperature along the cavity axis because of a compensation effect. The nonisothermal effect on the integrated cavity emissivity changes considerably with cavity geometry for a given temperature distribution.
Ohwada
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National Research Laboratory of Metrology, 1-1-4, Umezono, Sakura-mura, Niihari-gun, Ibaraki 305, Japan.