後ろ向きステップ共存対流の三次元熱流動に対する傾斜角の影響〔熱工学, 内燃機関, 動力など〕

概要

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Three-dimensional numerical simulations were carried out for mixed convective flows over a backward-facing step in a rectangular duct. Reynolds number, expansion ratio and aspect ratio were kept constant at Re=125,ER=2 and AR=16,respectively. Heat flux at the wall downstream of the step was kept uniform, while other walls were kept at adiabatic condition. Effect of the inclination angles, θ_1,θ_2,was the main objective in this study. It was found that when θ_1 was varied, the effect of buoyancy became prominent at θ_1=0°, 180°, while the effect was relatively small for the two horizontal cases (θ_1=90°, 270°). However, there was still small difference between θ_1=90° and 270° in the region immediately after the step where the flow was relatively slow. When θ_2 was varied, flow and thermal fields could no longer be considered as two dimensional, except when θ_2=-90°, 90°. The maximum Nusselt Number, which appears symmetrically near the side walls in pure forced convection cases, was obtained at only one location close to the lower side wall.
社団法人日本機械学会の論文
1998-06-25