1002 大規模乱流中における熱拡散場の特性(2)(OS10-1 大気海洋の流体現象と環境流体,OS10 大気海洋の流体現象と環境流体,オーガナイズドセッション)

概要

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Thermal diffusion from a point source was experimentally investigated in uniform shear flows having velocity gradients of 2.6, 6.1 s^<-1> and in quasi-isotropic turbulence fields. Short-time dispersion accompanied by the plume's meandering motion was realized in the large-scale turbulence fields of R_λ=310, 410 and 490, with the spectra of temperature fluctuation had clear inertial ranges. For sheared small-scale turbulence of R_λ=50 and 100, the turbulent Prandtl number Pr_t, in almost unchanged in the streamwise direction. The Pr_t was larger than ordinary Pr_t≒1.0, and approached approximately Pr_t≒1.44〜1.88, in the region where the plume's active meandering motion was clearly observed in the sheared large-scale turbulence.
一般社団法人日本機械学会の論文
2007-11-17