日本機械学会論文集 B編
Online ISSN : 1884-8346
Print ISSN : 0387-5016
大気乱流拡散の実験的シミュレーション : 第1報,大規模乱流場の特性と平均濃度分布
蒔田 秀治佐々 浩司飯田 明由茂山 正明
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56 巻 (1990) 522 号 p. 388-395

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Particle diffusion from a point source was experimentally investigated in a homogeneous and quasi-isotropic large-scale turbulence field. The particle concentration was measured by a laser counting system. The flow visualization showed the meandering of a particle plume and the diffusion coefficient reached about 130cm2/sec in the strong turbulence. The plume dispersed downstream in proporti on to t in the strong turbulence and to t1/2 in the weak turbulence. The results were well desctibed by the Taylor's theory. The empirical relation for the plume spread as a function of the travel time assured that the turbulence generator made it possible to simulate the atmospheric diffusion in a wind tunnel with conventional size.

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