等径球ランダム充てん体の統計的性質とバルーン焼結体の有効熱伝導率

概要

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Equal-sized sphere packings were constructed using a sequential deposition method and then various statistical properties of the packing were examined. From the examination, we discovered that their packing structures are affected by the gravity; more precisely, line segments connecting the centers of spheres in contact lie more frequently around the direction of 51 degrees from the vertical line, although they are uniformly distributed about the vertical line. Furthermore, with a parameter representing the degree of crystallization, we evaluated order/disorder of the packing structure; the packing is found to contain some ordered structures, in which there are more structures of simple cubic packing than those of compact hexagonal packing. Using the packing constructed, we estimated effective thermal conductivities of the "sintered" ballons with various ratios of inner and outer diameters, which range from 0.0 to 0.9. It was found that the conductivity drops remarkably for the ratio larger than 0.7. This is good for heat insulation.
一般社団法人日本機械学会の論文
2004-01-25