三次元充てん層内の放射エネルギーの透過に及ぼす側壁の影響

概要

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Transmittance of radiative energy is analyzed by using the Monte Carlo method through randomly packed spheres with an equal diameter. Two types of packed beds are used, which are also made by using the Monte Carlo method. One has no side wall and simulates a bed with infinite width in the directions perpendicular to the maximum incident radiation. Another has side walls positioned parallel to the direction of the maximum incident radiation. This simulates the experimental conditions of Chen & Churchill. From the analysis, the following results are obtained : (1) the existence of a low packing density layer adjacent to the side walls can explain the experimental results obtained by Chen & Churchill in which the reduction rate of the transmittance reduces at a point inside the entrance surface of the bed by the distance of one or two times the sphere diameter ; (2) the side-wall effects increase the transmittance by one order of magnitude ; (3) packed spheres with specular surfaces have higher transmittance than those with diffuse surfaces.
一般社団法人日本機械学会の論文
1989-09-25