表面があらい薄板状粒子によるふく射の散乱

抄録

For heat transfer problems, radiation scattering characteristics of particles of various sizes should be investigated. A significant percentage of such particles is larger than the wavelength of the radiation considered, and have micro-geometrical structures on the surfaces. The scattering characteristics can be affected strongly by the surface structure. This paper presents a new technique for modelling a flake-type metal particle with a rough surface, which has a three-dimensional self-similar micro-structure. We describe the scattering by the particle on the basis of an electromagnetic wave theory. The behavior is characterized by three factors : wavelength of radiation, size of the particle and size of micro-structure of the particle surface. It is shown that the scattering characteristics change from the particle scattering-type to the surface scattering-type with an increase in the particle size. It is emphasized that the size parameter range, in which the conventional theories of particle scattering are directly applicable, is restricted.