熱スクリーンによる中間加熱・冷却の多孔質内自然対流への影響

概要

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This paper deals with the effects of midheight cooling on natural convection and entropy generation in a porous layer heated from below. A porous screen, which is called as thermal screen in this paper, is adopted for the intermediate cooling with fluid flowing through internal passages formed within its solid matrix. It is shown from a numerical and analytical examination that the midheight cooling, reducing nonuniformity in horizontal temperature distributions, can control convective patterns and the associated heat transfer rate. Also, it is found that the midheight cooling can reduce the net entropy generation through the whole layer for certain convection regimes, and that the additional increase in the entropy generation due to convection is evaluated in terms of the porous Rayleigh number and the temperature level of the thermal screen.
一般社団法人日本機械学会の論文
1991-01-25