Abstract
By using the series solution of the effective emissivity in a semi-infinite cylindrical cavity with respect to a wall reflectivity shown in our previous literature, it can be analyzed theoretically that normally directed emission of the cavity from its aperture to a disk-type receiver holding a centerline in common with. Applying the results of this analysis, it can be evaluated that the hemispherical emissivity of a plane source with nano-sized cavities or tubes array that is consist of high-emissive material, such as carbon nanotubes. In some experiments, as high-density nanotubes are used, the represented single cavity is available; however, it cannot predict the top data by fabricating low-density nanotubes but can predict, considering the horizontal interreflection of fluxes penetrating the cavity's wall.
