垂直な平板に沿う強制ー自然共存対流の乱流熱伝達 : 壁面更新モデルと伝熱面温度分布の可視化を併用した熱伝達の予測

概要

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The mechanisms of the retardation and the enhancement of heat transfer in the combined convection region of the aiding and the opposing flows were investigated both experimentally and analytically in the present paper. The surface temperature distributions were visualized by the liquid crystal sheet. The results show that the low-temperature streaks or spots of large sizes appear in the whole regions of forced, natural and combined convections, and they exert a significant role or the heat transfer. Such low-temperature streaks or spots are generated as the result of the penetration of the low-temperature fluid lumps into the near wall regions. The surface renewal model was proposed to simulate the heat transport by the above fluid motion. It was found that the model predicted the heat transfer of the combined convection quite satisfactorily.
一般社団法人日本機械学会の論文
1988-09-25