E131 二重拡散による上昇煙の揺らぎ現象(OS-10 自然対流および複合対流の伝熱・流動研究の新展開III)

概要

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The double diffusive natural convection arises owing to the rate difference between thermal and solutal diffusions in a fluid containing temperature and concentration gradients. The double diffusive convection of ascending hot smoke was numerically studied at the Prandtl number Pr=0.71, the Rayleigh number Ra=10^9 or 10^<10>, the Lewis number Le=5 to 50, the area ratio of hot part against unit area S_i=0.032 or 0.77%, the buoyancy ratio N=0 to 1. The ascending thermal plume occurred due to the fast diffusion of heat from the heat source even at N=1, and then the dilute pollutant gas was included in the thermal plume. The thermal buoyancy became weak owing to the diffusion of heat with the rising of smoke, and then the smoke fluctuated owing to the balance between thermal and solutal buoyancies. When the Lewis number is large, the plume strongly fluctuated.
社団法人日本機械学会の論文
2005-11-02